In 2009 Stephen Hawking hosted “the party of the century.” No one came precisely because Stephen Hawking organized it

Bottles of the best French Champagne, tables full of canapés and cucumber sandwiches, balloons, banners and music. Stephen Hawkingthe famous theoretical physicist from the University of Cambridge, had everything ready to give the party of the century in June 2009. “I was waiting for a long time, but no one came,” explained a couple of years later. He wasn’t too surprised, especially since he only sent out the invitations after the party was already over. And not by mistake: Hawking’s party was the first major celebration dedicated specifically to time travelers. In 1992, Hawking had already proposed that time travel was impossible. So that afternoon party in the swamps of the River Cam was half an experiment to prove that the timetravelers They did not exist, half “trolling” all those theorists who thought that this type of trips could exist. In reality, it was a joke that is inserted into the historical controversy of time travel. For all we know, all the time travelers could be in the pub across the street laughing at poor Hawking and his old anti-travel ideas. It is not likely, there I agree with Hawking; but, today, we cannot rule out that working hypothesis. Everything (not) is on the internet I suppose that, therefore, that of the English physicist has not been the only attempt to search for time travelers. A few years later, in 2014, a team of physicists from the Michigan Institute of Technology used the internet and social networks to look for clues about possible trips. It was not about looking for people who defined themselves as “time travelers“, but to look for the trace of clairvoyance. That is, signs of people who knew things before they happened. The idea was to look for unequivocal messages, about things not previously known and significant enough to be recorded in the history books of the future. They chose two facts that met these three characteristics: Comet ISON and the name that Jorge Bergoglio would choose during his papacy, Francisco. The search, needless to say, was fruitless. Only in the case of Pope Francis did they find a prior reference to the choice of the name, but after analyzing it they discovered that it was a merely speculative text. Can you travel in time? The short answer is that we don’t know. The long answer is that, although it seems something banaldebates about the possibility of time travel continue to be a very controversial topic even today. And they remain so for a very simple reason: there is nothing in our scientific theories about the universe that prohibits per se this type of trips. Hence it is an exciting field full of theories, objections and counter-objections. Someday we will have to return to the topic and talk about the current controversies in time travel. But today, since it’s Sunday, I just wanted to remind you that if you ever pass through Cambridge on June 28, 2009, there is a party to which you are invited. Toast us. In Xataka | The most transformative event in modern cosmology is just around the corner, according to these physicists’ hypothesis In Xataka | Stephen Hawking made a prediction about black holes in 1971. A new signal has proven him overwhelmingly right

Stephen Hawking left a hidden treasure that has just been discovered. The problem is that it is in the form of floppy disks

The Cambridge University Library houses several historical treasures including letters from Isaac Newton and notebooks from Charles Darwin. Now they will take care also of manage 113 boxes with documents and memories of the physical Stephen Hawkingbut in those boxes they also found a surprise turned into a challenge: floppy disks. Lots of them. Computer pioneer. The famous physicist was an early user of those first computers in which data was stored on floppy disks. When he suffered from ALS this was a very important resource to be able to communicate and work, and now those disks that have just been discovered could contain all kinds of revealing data about Hawking’s life and work. Future Nostalgia. That’s what it’s called the project of the University of Cambridge and its library that precisely tries to safeguard all that information that in the past ended up being stored on floppy disks. Recovering such data is not easy when so much time has passed, and this project tries to educate about the best ways to preserve said information and transfer or recover it from those floppy disks. A format with an expiration date. Although one would think that floppy disks are a more secure way to store data than paper and ink, this physical medium also has clear disadvantages. The iron oxide covering the thin layer of plastic can degrade and lose its magnetic capabilities, meaning data could be lost forever. Each floppy disk is a world. With old books there are not too many problems when it comes to retrieving the information: you open them and read them (if you understand the language, of course). With floppy disks you need the hardware to be able to read them—a compatible disk drive—and also figure out how they are formatted. Leontien Talboom, responsible for this project, explained How to also clean those floppy disks was complex and there were various methods that they were exploring. These included the use of hand soap or isopropyl alcohol. Hawking used both a PC and a Mac. The disks arrived at the project in two batches. The first, with five and a quarter (5.25 inch) disks formatted on an MS-DOS based PC. The second, with three and a half disks, somewhat more recent and that were still used on an old Mac. According to Talboom, they are mainly talks that Hawking gave: “from a technical point of view they are really interesting because his talks were so big that he had to divide them into several floppy disks.” I wrote to speak. Hawking’s illness left him unable to speak for himself, so for years he used various voice synthesizers to express his ideas. Precisely for this reason he wrote so much on the computer and saved those documents on disk: this allowed him to use them later so that his synthesized voice could read said documents. Different discs, different readers. Although 5.25″ and especially 3.5″ discs were the most widespread, other formats were also seen such as eight inch discs which for example were used in the Churchill Archives Centre. Chris Knowles, one of the Future Nostalgia participants, explained how he bought a player for these discs on eBay. “It was a miracle that it worked,” but that allowed him to recover the information from those disks. Forgotten formats. They have also received some three-inch floppy disks, a much less widespread and peculiar format that had some success in the United Kingdom before the 3.5″ format was clearly imposed. To recover them, they ended up using an old reader manufactured by Amstrad that they had to modify to bring it back to life. And then there’s the software problem.. The information recovered from these disks can also pose another challenge: that it was created with software that was abandoned and even ended up disappearing. Some disks, for example, had documents written with a missing word processor called Diamond Word. That’s where a kind of “translation” comes into play to convert those files into something readable in the current era. Safeguarding our past. This work demonstrates how critical it is to try to protect and recover information from these old formats. Many of those floppy disks are 40 or 50 years old, and as Knowles says, “old emails and work calendars may not look like historical documents. They might seem banal. But they’re what Newton’s or Darwin’s letters would have looked like 200 years ago. Now they are fascinating documents that open a window to the past.” In Xataka | The 20 most important personal computers in the history of technology

The most detailed gravitational waves in history have just confirmed the great prediction of Stephen Hawking

After ten years Perfecting the detection of gravitational wavesLigo sensors achieved such a precise observation which has allowed physicists to confirm one of Stephen Hawking’s most famous predictions: the black holes area theorem. Ten years. A decade has passed since the scientists of the Ligo Observatory The universe listened for the first time in a completely new way: by detecting gravitational waves. On September 14, 2015, wrinkles in spacetime tissue Predicts by Albert Einstein a century earlier inaugurated a new era in astronomy. What was then an almost imperceptible cosmic whisper, today has become a symphony that sensors can clearly hear. And on the tenth anniversary of that milestone, the Ligo-Virgo-Kagra (LVK) collaboration has captured the most clear gravitational wave signal to date. GW250114. Detected on January 14, 2025, physicists believe that these gravitational waves were caused by the collision and subsequent fusion of two black holes to about 1.3 billion light years from the earth. Interestingly, the event is almost a twin that ended using Ligo’s physicists the 2017 Nobel PrizeGW150914. In both cases, it was two black holes with masses between 30 and 40 times that of our sun. But there is an abysmal difference: the signal quality. An unprecedented sharpness. Thanks to a decade of technological improvements and advances in quantum engineering, Ligo detectors are now almost four times more sensitive. While the first signal had a signal/noise ratio of 26, that of GW250114 has a 80. “We can hear it high and clear, and that allows us Physical Review Letters. This sharpness has been key to unraveling the secrets that were hidden in the vibrations of the black hole resulting from the merger. Hawking theorem. In 1971, Stephen Hawking proposed that the total area of ​​the event horizon of a black hole can never be reduced. It can increase or remain the same, but never shrink. This, which is known as the Hawking area theorem, is analogous to the second law of thermodynamics, which says that the entropy (the disorder) of an isolated system always increases. Therefore, the area of ​​a black hole is a measure of its entropy. Trying it is complicated. When two black holes merge, part of their mass becomes an enormous amount of energy in the form of gravitational waves (the famous E = mc²). In addition, the new black hole can turn much faster, and a larger turn implies a minor area for the same dough. Does the increase in mass compensate for these losses so that the final area is always greater? The analysis of GW250114 has been settled by the matter bluntly. Hawking was right. In this case, the two initial black holes had a combined area of ​​about 240,000 square kilometers. After the merger, the new black hole, with a mass of about 63 times that of the sun, it had an area of ​​400,000 square kilometers. If in 2021 a first test with the 2015 signal showed a 95%confidence, the new data raises that certainty to 99,999%. As Kip Thorne recalls, one of Ligo’s parents and Hawking personal friend, the British physicist called him right after the first detection in 2015 to ask if they could try his theorem. Hawking died in 2018but today his theory has been verified in a way that would have left him very satisfied. Einstein too. Thanks to this new signal, scientists have been able to analyze the moment just after the merger in which the new black hole vibrates like a newly hit bell before stabilizing. The frequencies and speed with which these tones are attenuated. It is the most solid test to the date that black holes are seemingly simple objects that can be completely described with only three properties: mass, spin and electric charge. All other information of the material that formed them is lost. But each detection of gravitational waves is one more piece in the puzzle of the cosmos. And as GW250114 demonstrates, to understand them we travel on the shoulders of giants such as Einstein and Hawking. Image | Aurore Simonnet (SSU/edeon)/LVK/URI In Xataka | Everything to know about gravitational waves: what they are, where are they and why we will not stop talking about them

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