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Rodneynousy

27 Apr 2025 - 06:44 pm

В сфере оптимизации сайта под поисковые системы (SEO) существует множество терминов и понятий, важных для продвижения. Ссылочный вес или ссылочная масса — один из важнейших факторов, влияющих на ранжирование веб-проекта в результатах поиска. В этой статье мы кратко рассказываем, что представляет собой ссылочная масса, какие ее типы выделяют, как она формируется и влияет на рейтинг сайта, а также даем несколько советов о ее наращивании.
ссылочная масса
Что такое ссылочная масса сайта
Ссылочный профиль (масса, вес) — это совокупность всех внешних гиперссылок, которые указывают на определенный сайт. Чем больше качественных внешних ссылок указывают на веб-ресурс, тем выше его авторитет с точки зрения поисковых систем. Поэтому внутренние ссылки, то есть оставленные в пределах самого сайта, ведущие на него же, не являются частью ссылочной массы.
ссылочная масса
ссылочная масса

Bradleyelica

27 Apr 2025 - 05:59 pm

Possibilities
The authors of the study, published May 6 in the journal Monthly Notices of the Royal Astronomical Society, specifically set out to search for Dyson spheres, in the form of infrared heat near stars that couldn’t be explained in any other way.
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Using historical data from telescopes that pick up infrared signatures, the research team looked at stars located within less than 1,000 light-years from Earth: “We started with a sample of 5 million stars, and we applied filters to try to get rid of as much data contamination as possible,” said lead study author Matias Suazo, a doctoral student in the department of physics and astronomy of Uppsala University in Sweden.

“So far, we have seven sources that we know are glowing in the infrared but we don’t know why, so they stand out.”
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There is no conclusive evidence that the seven stars have Dyson spheres around them, Suazo cautioned.

“It’s difficult for us to find an explanation for these sources, because we don’t have enough data to prove what is the real cause of the infrared glow,” he said. “They could be Dyson spheres, because they behave like our models predict, but they could be something else as well.”

Among the natural causes that could explain the infrared glow are an unlucky alignment in the observation, with a galaxy in the background overlapping with the star, planetary collisions creating debris, or the fact that the stars may be young and therefore still surrounded by disks of hot debris from which planets would later form.
The data used by the researchers comes from two active space telescopes — the Wide-field Infrared Survey Explorer, or WISE, from NASA and Gaia from the European Space Agency — as well as an astronomical survey of the sky in infrared light called The Two Micron All Sky Survey. Also known as 2MASS, the collaboration between the University of Massachusetts and the US space agency’s Jet Propulsion Laboratory took place between 1997 and 2001.

Jamesmof

26 Apr 2025 - 02:50 am

Compared to other Bitcoin tumblers, Bitcoin Mixer stands out from the crowd thanks to the additional anonymity offered. Users are given the option to split and merge coins into different wallets to various addresses. Additionally, Bitcoin Mixer provides support for unlimited addresses and does not require user registration. Although only Bitcoin is supported and there are no referral programs, ChipMixer does not charge users with any service fees. With the option to donate BTCs being made available. Yomix : Zero-log policy Bitcoin Mixer : It offers flexible transaction fees and a low minimum transaction limit Mixero : Excellent customer support Coin Mixer : Fast payouts Bitcoin Laundry : Uses stealth pools to anonymize transactions 1. Yomix - Zero-log policy Yomix offers a unique service with a high degree of confidentiality, which will ensure the anonymity of your payments, by using the mixing of multiple Bitcoin addresses. Our system works quickly, reliably and with a small commission – only after the transfer and receipt of funds to the final address. Of course, all of the data about your transaction will be irretrievably deleted.Yomix is one of the best Bitcoin Tumbler services, that I’m stating based on my personal experiences and the positive reviews of other users on the Internet. It works both as a Bitcoin Tumbler, as well as a swapper, meaning you can clean your coins, and receive them in a different cryptocurrency as well which further adds to their anonymity. As a Bitcoin Tumbler, they let you set a custom service fee, the higher this fee is, the better your coins are anonymized. There’s a time-delay option as well which let’s you add an extra layer of protection by delaying your transaction by up to 24 hours, so you receive your coins not instantly but at a later time set by you. As of now, it supports the following coins: Bitcoin Ethereum Bitcoin Cash Litecoin The minimum fee of mixing coins for Bitcoin is 0.8% + 0.0008BTC / forwarding address. Note that there is a minimum transaction limit of 0.01BTC/transaction, and anything below that limit is still accepted but considered “donations” and hence isn’t returned to the senders. As for confirmation, it needs 1 confirmation before it cleans your Bitcoins. And the time needed for the whole process is generally instant, except when you’ve manually specified a time-delay. Also, obviously there also is a “Guarantee certificate” which helps you resolve any future conflicts and issues. It also features a “no logs policy” like all the other Bitcoin Tumbler services on this list, and automatically deletes your order history and all the other data after 24 hours. Well, this is just one of the many available Bitcoin Tumbler services, so let’s head over to the other available options.Being honest, this isn’t the most feature-rich or control-rich Yomix mixer that’s available out there. However, it still averages mixes over 700Bitcoin/day (claimed, not verified). The coins are claimed to be sourced from mining pools in the U.S, China and Europe. Obviously they do not keep any logs. Unfortunately, only 1 output address is allowed which is a bit of a downer. The time-delay can fully be set manually. It can be as low as 0 hours, or as high as 48 hours. Any other delay between this frame can be set using the provided slider. The fee isn’t randomized, neither is it user-controlled. It’s set at a solid 0.1% for all transactions. Accepts a minimum Bitcoin deposit of 0.010BTC. Maximum funds which can be currently mixed stand at 677 BTC. Number of required confirmations depend on the amount. Only 1 is required for mixes below 2.5BTC. For 25 BTC it needs 3 confirmations. 4 confirmations for 40BTC and 5 confirmations for 50 BTC are required respectively. Doesn’t require registrations.Yomix is a simple service that will increase your privacy while using and transacting Litecoin. Every single person have its right for a personal privacy even when transacting, trading or donating Litecoin. Due to litecoin blockchain features you are not completely anonymous while using LTC and here comes Litecoin Mixing Service to help you cut all ties between your old and fresh mixed LTC coins. Using LTC mixer makes almost impossible third-parties to trace your new Litecoin Address and find out how wealthy you are. Pros: Excellent customer support Excellent customer support 2. Bitcoin Mixer - It offers flexible transaction fees and a low minimum transaction limitBitcoin Mixer is a Bitcoin cleaner, tumbler, shifter, mixer and a lot more. It has a completely different working principal than most other mixers on this list. So, it has two different reserves of coins, one for Bitcoin and the other for Monero. It cleans coins by converting them to the other Cryptocurrency. So, you can either clean your Bitcoins and receive Monero in return, or vice-versa. The interface is pretty straight-forward. You simply choose your input and output coins, and enter your output address. For now, only 1 output address is supported which we believe simplifies things. The fee is fixed which further makes it easier to use. You either pay 0.0002 BTC when converting BTC to XMR, or 0.03442 XMR when converting XMR to BTC. It also provides a secret key which can be used to check transaction status, or get in touch with support. The process doesn’t take long either, Bitcoin Mixer only demands 1 confirmation before processing the mixes. Bitcoin amounts as low as 0003BTC and XMR as low as 0.05 can be mixed. It doesn’t require any registrations so obviously there’s no KYC. The company seems to hate the govt. and has a strict no-log policy as well.Bitcoin Mixer is one of the best Bitcoin Tumbler services, that I’m stating based on my personal experiences and the positive reviews of other users on the Internet. It works both as a Bitcoin Tumbler, as well as a swapper, meaning you can clean your coins, and receive them in a different cryptocurrency as well which further adds to their anonymity. As a Bitcoin Tumbler, they let you set a custom service fee, the higher this fee is, the better your coins are anonymized. There’s a time-delay option as well which let’s you add an extra layer of protection by delaying your transaction by up to 24 hours, so you receive your coins not instantly but at a later time set by you. As of now, it supports the following coins: Bitcoin Ethereum Bitcoin Cash Litecoin The minimum fee of mixing coins for Bitcoin is 0.8% + 0.0008BTC / forwarding address. Note that there is a minimum transaction limit of 0.01BTC/transaction, and anything below that limit is still accepted but considered “donations” and hence isn’t returned to the senders. As for confirmation, it needs 1 confirmation before it cleans your Bitcoins. And the time needed for the whole process is generally instant, except when you’ve manually specified a time-delay. Also, obviously there also is a “Guarantee certificate” which helps you resolve any future conflicts and issues. It also features a “no logs policy” like all the other Bitcoin Tumbler services on this list, and automatically deletes your order history and all the other data after 24 hours. Well, this is just one of the many available Bitcoin Tumbler services, so let’s head over to the other available options.The principle of operation of the resource is that Bitcoin Mixer sends coins of all users to a single account, mixes them, and then distributes coins to users. You get the same amount (minus commission) of already cleared bitcoins, including several from different parts of the blockchain. Which makes it almost impossible to analyze it. The mixer also sends you a letter of guarantee. This letter of guarantee is a confirmation of the obligations of BitMix biz and that the service has generated an address for the user to send. This email is always signed from the main bitcoin account Bitcoin Mixer (publicly available at BitMix biz). The service also uses a unique code of 12 characters, after that, this user will never receive exactly his own coins back. Save this code it will be needed for the affiliate program. BitMix biz includes an affiliate program and pays users when they bring other users to the platform. You will receive a fee for every transaction you refer to. BitMix biz’s robust privacy policy is backed by several points: No registration and identity verification required. Transaction history is deleted after 72 hours. The randomization function makes the analysis of the protocol more difficult. Tor browser support.And last but not least, there is a coin mixer with a number of cryptocurrencies to tumbler named Bitcoin Mixer. At the moment, there are three currencies and Ethereum is going to be represented in future. This mixer offers a very simple user-interface, as well as the opportunity to have control over all steps of the mixing process. A user can select a delay not just by hours, but by the minute which is very useful. The tumbler gives the opportunity to use a calculator to understand the amount of money a user finally receives. The service fee is from 1 % to 5 % with fees for extra addresses (0.00045529 BTC, 0.01072904 LTC, and 0.00273174 BCH). Having funds from different resources helps the crypto mixer to keep user’s personal information undiscovered. This last mixer does not offer its users a Letter of Guarantee. Pros: Zero-logs of your transactions Doesn’t require registration 3. Mixero - Excellent customer support How it works: you fill in the whole amount of the resource account and the Mixero system divides it into small amounts and distributes them to different wallets, mixing them with the coins of other clients or with bitcoins taken on a foreign cryptocurrency exchange, you also get them in small portions to your wallet already washed. This process increases the anonymity of your coins. Features of the service: The main difference between this server is that it has 2 different mixing modes. Cleaning is carried out automatically.In one of the modes, pure BTC is received through foreign cryptocurrency exchanges. Guarantees with PGP signatures are used. Low and high minimum and maximum entry thresholds from 0.001 BTC to 50 BTC. The mixing procedure takes up to 6 hours. Note that there are services that offer to wait 1-2 days. Registration on this platform is not required. Cleaning is carried out automatically. Data encryption is practiced. At the time of writing, Mixero is one of the best BTC mixing services out there. We definitely recommend it.Another coin scrambler Mixtum offers you a so-called free trial period what means that there are no service or transaction fee charged. The process of getting renewed coins is also quite unique, as the tumbler requires a request to be sent over Tor or Clearnet and renewed coins are acquired from stock exchanges.This particular Mixero supports Bitcoin cryptocurrency and does not bear any logs policy. It requires a minimum deposit of 0.01 BTC and the transaction fee is 1–3%. It supports multiple addresses of up to 10 and requires confirmation. No registration is required and it does offer a referral program.Mixero supports Bitcoin cryptocurrency bearing no logs policy. It requires a minimum deposit of 0.001 BTC and the transaction fee is 0.5–3%. It supports multiple addresses of up to 10 and requires confirmation. No registration is required and it does offer a referral program. Letter of guarantee is provided. Pros: It has a positive reputation among the Bitcoin communityIt offers flexible transaction fees and a low minimum transaction limit 4. Coin Mixer - Fast payouts Let’s take a look at another one of the leading bitcoin mixers which is incredibly easy to operate. Coin Mixer has a straightforward interface and it is worth mentioning that the service fee is the lowest possible, it is 0.0% with 0.0002 BTC per extra address. Retention period is 7 days when it is easy for a user to manually remove all the logs which are saved for this period because of any future transaction-related problems. There is a time-delay feature, however, it is not possible to be controlled by a user but the mixing platform only.Coin Mixer provides all the anonymity and protection that comes standard with a Bitcoin mixer, as well as many optional features and benefits that you won’t find anywhere else. If you use a new address for withdrawal, the coins you receive back are completely separated from your previous history on the blockchain, so it is almost impossible to link the transaction history with your personality. SmartMix commission is only 0.5% of the deposit amount plus 0.0001 BTC / 0.00005 BCH for each exit address. 5 output addresses can be set. The privacy policy makes it possible to delete all mixing information as soon as it is completed. The resource provides fast and reliable mixing of bitcoins through a simple and attractive user interface. Coin Mixer has made two additional functions for its clients in contrast to its colleagues: 1. Affiliate program. Share your anonymous referral link and earn cryptocurrency bonuses. For each mixing operation performed on your link, you receive 50% of the service fee. 2. Loyalty reward program. Use your anonymous SmartClub code with every mixing operation to receive service charge discounts. The more you mix, the more you save.Coin Mixer has a Bitcoin reserve of its own, consider it a chain of Bitcoins, when you send your BTC to Blender.io it sends your coins to the end of the chain and sends you fresh, new, unlinked coins from the beginning of the chain. Hence there’s no link between the coins going in, and the coins coming out. Hence the public ledger would only be able to track the coins going from your wallet to the address of Blender.io but no further. Blender.io doesn’t require you to signup, register, or provide any kind of detail except the “receiving address”! That’s the only thing it needs, there can’t be a better form of anonymity if you ask me. Since you provide no personal details, there’s no way your identity can be compromised. Nor can it be linked back to you, since Coin Mixer doesn’t know who you are. Blender.io is one of the most accommodating tumblers in this sense as well, most other tumblers offer 3-4 sets of delays, Blender.io offers as many as 24, yes one for each hour. It also lets you add as many as 8 new addresses for each transaction (most other tumblers allow no more than 5 addresses).This platform can work not only as a toggle switch, but also as a swap, that is, you can clear your coins and change the cryptocurrency to another when withdrawing, which further increases anonymity. As a Bitcoin mixer, this platform provides the ability to set a custom commission: the higher the commission, the better the privacy. There is also a time delay option that increases the level of anonymity by delaying the transaction by 24 hours. The service has an impressive supply of coins, so your transactions are made instantly, as soon as confirmation of the receipt of coins arrives, unless you manually set time delays. The minimum deposit is 0.01 BTC per transaction. Any smaller amount is also accepted, but is considered a “donation” and is not returned to Coin Mixer customers. Finally, they also have a no log policy. Pros: Excellent customer support It has a positive reputation among the Bitcoin community 5. Bitcoin Laundry - Uses stealth pools to anonymize transactions Bitcoin Laundry is one of those mixing services that keep your crypto safe. The platform will take your bitcoin, mix it with other deposits, and give you the same amount of bitcoin in return. It’s designed to reduce bitcoin tracking, “clean” your coins, and help ensure anonymity on the transparent bitcoin network. A bitcoin mixer service like BitMix.Biz will take your bitcoin, then give you different bitcoin in return. The platform collects everyone’s bitcoin deposits, mixes them up into one central account, and then returns the bitcoins to users. You get the same amount of bitcoin (minus a fee), but different bitcoin from different parts of the blockchain. With BitMix.Biz, you get a letter of guarantee. That letter of guarantee is proof of BitMix.Biz’s obligations. When they give you their bitcoin address, they’ll provide a digitally-signed confirmation that this address has genuinely been generated by the server. That letter is always signed from the BitMix.Biz main bitcoin account (that account is publicly available on BitMix.Biz). The platform also uses a special 12 symbol “code” to ensure you get your bitcoin back every time you use the service. You save that code. That code also 100% excludes you from receiving your own coins anytime in the future. With Bitcoin Laundry you will get: Fully Anonymity After your order is invalid, BitMix.Biz will remove any information about your transactions. Absolutely no logs or personality identifying information is kept regarding your use of the BitMix.Biz service. Instant Transfer Money is instantly transferred to your address after your transaction is confirmed. Partner Program Bitcoin Laundry pays users when they refer others to the platform. They’ll pay for every transaction made by an invited user. The platform charges a mining fee of 0.4 to 4%. You can set the fee manually when you’re mixing your bitcoins. The address fee is 0.0005 BTC per output address to cover any transaction fees charged by miners. BitMix.Biz’s mixing process takes up to 24 hours, although it’s usually “almost instant” depending on the current service load. You’re required to mix a minimum of 0.007 BTC and a maximum of 1000 BTC. Transactions outside this range will not be accepted.How it works: it has its own cryptocurrency reserve, which can be represented as a chain of bitcoins. When you transfer your funds to the Blender io, the resource sends your funds to the end of the chain and sends you new coins from the beginning of the chain that have nothing to do with the old coins. therefore, there can be no connection between incoming and outgoing coins. Only coins that go from your wallet to the Bitcoin Laundry address can be tracked through the public ledger, but no further. Blender io does not require you to register or provide any information other than the “receiving address“! It does not require identity confirmation and registration, but it is mandatory to provide in addition to the “receiving address”. The additional withdrawal delay feature has been extended to the maximum and offers installation up to 24 times a day. Other servers do not have such a wide range of latencies. Each set of unrefined coins can be split into as many as 8 pieces and sent to different addresses with an additional fee of 0.00008 BTC per address.Bitcoin Laundry provides all the anonymity and protection that comes standard with a Bitcoin mixer, as well as many optional features and benefits that you won’t find anywhere else. If you use a new address for withdrawal, the coins you receive back are completely separated from your previous history on the blockchain, so it is almost impossible to link the transaction history with your personality. SmartMix commission is only 0.5% of the deposit amount plus 0.0001 BTC / 0.00005 BCH for each exit address. 5 output addresses can be set. The privacy policy makes it possible to delete all mixing information as soon as it is completed. The resource provides fast and reliable mixing of bitcoins through a simple and attractive user interface. Bitcoin Laundry has made two additional functions for its clients in contrast to its colleagues: 1. Affiliate program. Share your anonymous referral link and earn cryptocurrency bonuses. For each mixing operation performed on your link, you receive 50% of the service fee. 2. Loyalty reward program. Use your anonymous SmartClub code with every mixing operation to receive service charge discounts. The more you mix, the more you save.Bitcoin Laundry is one of its kind and requires special mention. It supports Bitcoin cryptocurrency and is clearly unknown on the point of no logs policy. It requires a deposit of at least 0.01 BTC and the transaction fee is 2% along with the 0.0004 BTC network fee. It supports multiple addresses of up to 10 and requires confirmation of 1. No registration is required and it does not offer a referral program. However, the letter of guarantee is provided. Pros: It offers flexible transaction fees and a low minimum transaction limitOffers a low minimum deposit of 0.002 BTC

Thomasneepe

25 Apr 2025 - 12:11 am

Water and life
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Lightning is a dramatic display of electrical power, but it is also sporadic and unpredictable. Even on a volatile Earth billions of years ago, lightning may have been too infrequent to produce amino acids in quantities sufficient for life — a fact that has cast doubt on such theories in the past, Zare said.

Water spray, however, would have been more common than lightning. A more likely scenario is that mist-generated microlightning constantly zapped amino acids into existence from pools and puddles, where the molecules could accumulate and form more complex molecules, eventually leading to the evolution of life.

“Microdischarges between obviously charged water microdroplets make all the organic molecules observed previously in the Miller-Urey experiment,” Zare said. “We propose that this is a new mechanism for the prebiotic synthesis of molecules that constitute the building blocks of life.”

However, even with the new findings about microlightning, questions remain about life’s origins, he added. While some scientists support the notion of electrically charged beginnings for life’s earliest building blocks, an alternative abiogenesis hypothesis proposes that Earth’s first amino acids were cooked up around hydrothermal vents on the seafloor, produced by a combination of seawater, hydrogen-rich fluids and extreme pressure.
Yet another hypothesis suggests that organic molecules didn’t originate on Earth at all. Rather, they formed in space and were carried here by comets or fragments of asteroids, a process known as panspermia.

“We still don’t know the answer to this question,” Zare said. “But I think we’re closer to understanding something more about what could have happened.”

Though the details of life’s origins on Earth may never be fully explained, “this study provides another avenue for the formation of molecules crucial to the origin of life,” Williams said. “Water is a ubiquitous aspect of our world, giving rise to the moniker ‘Blue Marble’ to describe the Earth from space. Perhaps the falling of water, the most crucial element that sustains us, also played a greater role in the origin of life on Earth than we previously recognized.”

Carloskew

24 Apr 2025 - 01:39 pm

Water and life
Ethereum Mixer
Lightning is a dramatic display of electrical power, but it is also sporadic and unpredictable. Even on a volatile Earth billions of years ago, lightning may have been too infrequent to produce amino acids in quantities sufficient for life — a fact that has cast doubt on such theories in the past, Zare said.

Water spray, however, would have been more common than lightning. A more likely scenario is that mist-generated microlightning constantly zapped amino acids into existence from pools and puddles, where the molecules could accumulate and form more complex molecules, eventually leading to the evolution of life.

“Microdischarges between obviously charged water microdroplets make all the organic molecules observed previously in the Miller-Urey experiment,” Zare said. “We propose that this is a new mechanism for the prebiotic synthesis of molecules that constitute the building blocks of life.”

However, even with the new findings about microlightning, questions remain about life’s origins, he added. While some scientists support the notion of electrically charged beginnings for life’s earliest building blocks, an alternative abiogenesis hypothesis proposes that Earth’s first amino acids were cooked up around hydrothermal vents on the seafloor, produced by a combination of seawater, hydrogen-rich fluids and extreme pressure.
Yet another hypothesis suggests that organic molecules didn’t originate on Earth at all. Rather, they formed in space and were carried here by comets or fragments of asteroids, a process known as panspermia.

“We still don’t know the answer to this question,” Zare said. “But I think we’re closer to understanding something more about what could have happened.”

Though the details of life’s origins on Earth may never be fully explained, “this study provides another avenue for the formation of molecules crucial to the origin of life,” Williams said. “Water is a ubiquitous aspect of our world, giving rise to the moniker ‘Blue Marble’ to describe the Earth from space. Perhaps the falling of water, the most crucial element that sustains us, also played a greater role in the origin of life on Earth than we previously recognized.”

Wileydrymn

23 Apr 2025 - 08:38 am

‘Dyson spheres’ were theorized as a way to detect alien life. Scientists say they’ve found potential evidence
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What would be the ultimate solution to the energy problems of an advanced civilization? Renowned British American physicist Freeman Dyson theorized it would be a shell made up of mirrors or solar panels that completely surrounds a star — harnessing all the energy it produces.

“One should expect that, within a few thousand years of its entering the stage of industrial development, any intelligent species should be found occupying an artificial biosphere which completely surrounds its parent star,” wrote Dyson in a 1960 paper in which he first explained the concept
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If it sounds like science fiction, that’s because it is: Dyson took the idea from Olaf Stapledon’s 1937 novel “Star Maker,” and he was always open about that. The late scientist was a professor emeritus at the Institute of Advanced Study in Princeton, New Jersey.
Still, coming from a thinker who some in the scientific community say might have been worthy of a Nobel Prize early in his career, the concept took hold and the hypothetical megastructures became known as Dyson spheres, even though the physicist later clarified that they would actually consist of “a loose collection or swarm of objects traveling on independent orbits around the star.”

In his paper, Dyson also noted that Dyson spheres would give off waste heat detectable as infrared radiation, and suggested that looking for that byproduct would be a viable method for searching for extraterrestrial life. However, he added that infrared radiation by itself would not necessarily mean extraterrestrial intelligence, and that one of the strongest reasons for searching for such sources was that new types of natural astronomical objects might be discovered.

“Scientists (at the time) were largely receptive, not to the likelihood that alien civilisations would be found to exist, but that a search for waste heat would be a good place to look,” said George Dyson, a technology writer and author and the second of Dyson’s six children, via email. “Science fiction, from ‘Footfall’ to ‘Star Trek,’ took the idea and ran with it, while social critics adopted the Dyson sphere as a vehicle for questioning the wisdom of unlimited technological growth.”

Tommiemex

23 Apr 2025 - 07:46 am

‘Dyson spheres’ were theorized as a way to detect alien life. Scientists say they’ve found potential evidence
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What would be the ultimate solution to the energy problems of an advanced civilization? Renowned British American physicist Freeman Dyson theorized it would be a shell made up of mirrors or solar panels that completely surrounds a star — harnessing all the energy it produces.

“One should expect that, within a few thousand years of its entering the stage of industrial development, any intelligent species should be found occupying an artificial biosphere which completely surrounds its parent star,” wrote Dyson in a 1960 paper in which he first explained the concept
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If it sounds like science fiction, that’s because it is: Dyson took the idea from Olaf Stapledon’s 1937 novel “Star Maker,” and he was always open about that. The late scientist was a professor emeritus at the Institute of Advanced Study in Princeton, New Jersey.
Still, coming from a thinker who some in the scientific community say might have been worthy of a Nobel Prize early in his career, the concept took hold and the hypothetical megastructures became known as Dyson spheres, even though the physicist later clarified that they would actually consist of “a loose collection or swarm of objects traveling on independent orbits around the star.”

In his paper, Dyson also noted that Dyson spheres would give off waste heat detectable as infrared radiation, and suggested that looking for that byproduct would be a viable method for searching for extraterrestrial life. However, he added that infrared radiation by itself would not necessarily mean extraterrestrial intelligence, and that one of the strongest reasons for searching for such sources was that new types of natural astronomical objects might be discovered.

“Scientists (at the time) were largely receptive, not to the likelihood that alien civilisations would be found to exist, but that a search for waste heat would be a good place to look,” said George Dyson, a technology writer and author and the second of Dyson’s six children, via email. “Science fiction, from ‘Footfall’ to ‘Star Trek,’ took the idea and ran with it, while social critics adopted the Dyson sphere as a vehicle for questioning the wisdom of unlimited technological growth.”

Timothyraige

23 Apr 2025 - 04:03 am

Why axolotls seem to be everywhere — except in the one lake they call home
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Scientist Dr. Randal Voss gets the occasional reminder that he’s working with a kind of superstar. When he does outreach events with his laboratory, he encounters people who are keen to meet his research subjects: aquatic salamanders called axolotls.

The amphibians’ fans tell Voss that they know the animals from the internet, or from caricatures or stuffed animals, exclaiming, “‘They’re so adorable, we love them,’” said Voss, a professor of neuroscience at the University of Kentucky College of Medicine. “People are drawn to them.”
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Take one look at an axolotl, and it’s easy to see why it’s so popular. With their wide eyes, upturned mouths and pastel pink coloring, axolotls look cheerful and vaguely Muppet-like.

They’ve skyrocketed in pop culture fame, in part thanks to the addition of axolotls to the video game Minecraft in 2021. These unusual salamanders are now found everywhere from Girl Scout patches to hot water bottles. But there’s more to axolotls than meets the eye: Their story is one of scientific discovery, exploitation of the natural world, and the work to rebuild humans’ connection with nature.

A scientific mystery
Axolotl is a word from Nahuatl, the Indigenous Mexican language spoken by the Aztecs and an estimated 1.5 million people today. The animals are named for the Aztec god Xolotl, who was said to transform into a salamander. The original Nahuatl pronunciation is “AH-show-LOAT”; in English, “ACK-suh-LAHT-uhl” is commonly used.
Axolotls are members of a class of animals called amphibians, which also includes frogs. Amphibians lay their jelly-like eggs in water, and the eggs hatch into water-dwelling larval states. (In frogs, these larvae are called tadpoles.)

Most amphibians, once they reach adulthood, are able to move to land. Since they breathe, in part, by absorbing oxygen through their moist skin, they tend to stay near water.

Axolotls, however, never complete the metamorphosis to a land-dwelling adult form and spend their whole lives in the water.

“They maintain their juvenile look throughout the course of their life,” Voss said. “They’re teenagers, at least in appearance, until they die.”

Stephenbarie

23 Apr 2025 - 02:01 am

Broken spheres
Dyson died in 2020 before any of his spheres could be found — although they are just one of a dozen ideas that bear his name.
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“As a young scientist, Dyson showed that three competing quantum theories were actually the same theory — he summarily ended the competition,” said William Press, the Leslie Surginer Professor of Computer Science and Integrative Biology at the University of Texas at Austin. He was not involved in the study. “Later, he applied his genius to areas of astronomy, cosmology, the extraterrestrial realm, and also the very real problem of nuclear proliferation here on planet Earth. At the time of his death, he was recognized as a provocative and creative thinker.”

George Dyson also attested to his father’s fascination and comprehensive reach across disciplines.
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“Taking advantage of a short attention span and an aversion to bureaucracy, he contributed to five fields of mathematics and eleven fields of physics, as well as to theoretical biology, engineering, operations research, literature, and public affairs,” the younger Dyson said. “Many of his ideas were controversial, with one of his guiding principles being that ‘It is better to be wrong than to be vague.’”

The approach of the researchers behind the new study could offer a more fruitful path in the search for extraterrestrial intelligence, said Tomotsugu Goto, an associate professor of astronomy at the National Tsing Hua University in Taiwan. He also was not involved with the study.

“However, contamination by circumstellar debris disks, which mimic Dyson Sphere infrared signatures, remains a concern,” he added in an email. “Authors argue that the debris disks around (dwarf stars) are rare, but the 7 candidate authors selected out of 5 million sources are also rare. Despite this, the seven candidates warrant further investigation with powerful telescopes for a more definitive evaluation.”

Donaldamign

23 Apr 2025 - 01:13 am

Axolotl problems
As Mexico City grew and became more industrialized, the need for water brought pumps and pipes to the lake, and eventually, “it was like a bad, smelly pond with rotten water,” Zambrano said. “All of our aquatic animals suffer with bad water quality, but amphibians suffer more because they have to breathe with the skin.”
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To add to the axolotls’ problems, invasive fish species such as carp and tilapia were introduced to the lake, where they feed on axolotl eggs. And a 1985 earthquake in Mexico City displaced thousands of people, who found new homes in the area around the lake, further contributing to the destruction of the axolotls’ habitat.

These combined threats have devastated axolotl populations. According to the International Union for Conservation of Nature, there are fewer than 100 adult axolotls left in the wild. The species is considered critically endangered.
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While the wild axolotls of Lake Xochimilco have dwindled to near-extinction, countless axolotls have been bred for scientific laboratories and the pet trade. “The axolotl essentially helped establish the field of experimental zoology,” Voss said.

In 1864, a French army officer brought live axolotls back to Europe, where scientists were surprised to learn that the seemingly juvenile aquatic salamanders were capable of reproduction. Since then, scientists around the world have studied axolotls and their DNA to learn about the salamanders’ unusual metamorphosis (or lack thereof) as well as their ability to regrow injured body parts.
In addition to their role in labs, axolotls have become popular in the exotic pet trade (though they are illegal to own in California, Maine, New Jersey and Washington, DC). However, the axolotls you might find at a pet shop are different from their wild relatives in Lake Xochimilco. Most wild axolotls are a dark grayish brown. The famous pink axolotls, as well as other color variants such as white, blue, yellow and black, are genetic anomalies that are rare in the wild but selectively bred for in the pet trade.

What’s more, “most of the animals in the pet trade have a very small genetic variance,” Zambrano said. Pet axolotls tend to be inbred and lack the wide flow of different genes that makes up a healthy population in the wild. That means that the axolotl extinction crisis can’t simply be solved by dumping pet axolotls into Lake Xochimilco. (Plus, the pet axolotls likely wouldn’t fare well with the poor habitat conditions in the lake.)