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Submission + - Another large Black hole in "our" Galaxy (arxiv.org)

Submitted by RockDoctor
RockDoctor writes: A recent paper on ArXiv reports a novel idea about the central regions of "our" galaxy.

Remember the hoopla a few years ago about radio-astronomical observations producing an "image" of our central black hole — or rather, an image of the accretion disc around the black hole — long designated by astronomers as "Sagittarius A*" (or SGR-A*)? If you remember the image published then, one thing should be striking — it's not very symmetrical. If you think about viewing a spinning object, then you'd expect to see something with a "mirror" symmetry plane where we would see the rotation axis (if someone had marked it). If anything, that published image has three bright spots on a fainter ring. And the spots are not even approximately the same brightness.

This paper suggests that the image we see is the result of the light (radio waves) from SGR-A* being "lensed" by another black hole, near (but not quite on) the line of sight between SGR-A* and us. By various modelling approaches, they then refine this idea to a "best-fit" of a black hole with mass around 1000 times the Sun, orbiting between the distance of the closest-observed star to SGR-A* ("S2" — most imaginative name, ever!), and around 10 times that distance. That's far enough to make a strong interaction with "S2" unlikely within the lifetime of S2 before it's accretion onto SGR-A*.)

The region around SGR-A* is crowded. Within 25 parsecs (~80 light years, the distance to Regulus [in the constellation Leo] or Merak [in the Great Bear]) there is around 4 times more mass in several millions of "normal" stars than in the SGR-A* black hole. Finding a large (not "super massive") black hole in such a concentration of matter shouldn't surprise anyone.

This proposed black hole is larger than anything which has been detected by gravitational waves (yet) ; but not immensely larger — only a factor of 15 or so. (The authors also anticipate the "what about these big black holes spiralling together?" question : quote "and the amplitude of gravitational waves generated by the binary black holes is negligible.")

Being so close to SGR-A*, the proposed black hole is likely to be moving rapidly across our line of sight. At the distance of "S2" it's orbital period would be around 26 years (but the "new" black hole is probably further out than than that). Which might be an explanation for some of the variability and "flickering" reported for SGR-A* ever since it's discovery.

As always, more observations are needed. Which, for SGR-A* are frequently being taken, so improving (or ruling out) this explanation should happen fairly quickly. But it's a very interesting, and fun, idea.

Submission + - Surado, formerly Slashdot Japan, is closing at the end of the month. (srad.jp) 1

Submitted by AmiMoJo
AmiMoJo writes: Slashdot Japan was launched on May 28, 2001. On 2025/03/31, it will finally close. Since starting the site separated from the main Slashdot one, and eventually rebranded as "Surado", which was it's Japanese nickname.

Last year the site stopped posting new stories, and was subsequently unable to find a buyer. In a final story announcing the end, many users expressed their sadness and gratitude for all the years of service.

Submission + - Fifteen Years Later, Citizens United Defined the 2024 Election (brennancenter.org)

Submitted by NewYorkCountryLawyer
NewYorkCountryLawyer writes: The influence of wealthy donors and dark money was unprecedented. Much of it would have been illegal before the Supreme Court swept away long-established campaign finance rules. Citizens United v. Federal Election Commission, the Supreme Court’s controversial 2010 decision that swept away more than a century’s worth of campaign finance safeguards, turns 15 this month. The late Justice Ruth Bader Ginsburg called it the worst ruling of her time on the Court. Overwhelming majorities of Americans have consistently expressed disapproval of the ruling, with at least 22 states and hundreds of cities voting to support a constitutional amendment to overturn it. Citizens United reshaped political campaigns in profound ways, giving corporations and billionaire-funded super PACs a central role in U.S. elections and making untraceable dark money a major force in politics. And yet it may only be now, in the aftermath of the 2024 election, that we can begin to understand the full impact of the decision.

Submission + - Anti-Trump Searches Appear Hidden on TikTok (ibtimes.com)

Submitted by AmiMoJo
AmiMoJo writes: Searches for anti-Trump content are now appearing hidden on TikTok for many users after the app came back online in the U.S. TikTok users have taken to Twitter to share that when they search for topics negatively related to President Donald Trump, a message pops up saying "No results found" and that the phrases may violate the app's guidelines. One user said that when they tried to search "Donald Trump rigged election" on a U.S. account, they were met with blocked results. Meanwhile, the same phrase searched from a U.K. account prompted results. Another user shared video of them switching between a U.S. and U.K. VPN to back up the user's viral claims, which has since amassed more than 187,000 likes.
Crime

Silk Road Creator Ross Ulbricht Pardoned (bbc.com) 339

Posted by BeauHD from the wow dept.
Slashdot readers jkister and databasecowgirl share the news of President Donald Trump issuing a pardon to Silk Road creator Ross Ulbricht. An anonymous reader shares a report from the BBC: US President Donald Trump says he has signed a full and unconditional pardon for Ross Ulbricht, who operated Silk Road, the dark web marketplace where illegal drugs were sold. Ulbricht was convicted in 2015 in New York in a narcotics and money laundering conspiracy and sentenced to life in prison. Trump posted on his Truth Social platform that he had called Ulbricht's mother to inform her that he had granted a pardon to her son. Silk Road, which was shut down in 2013 after police arrested Ulbricht, sold illegal drugs using Bitcoin, as well as hacking equipment and stolen passports.

"The scum that worked to convict him were some of the same lunatics who were involved in the modern day weaponization of government against me," Trump said in his post online on Tuesday evening. "He was given two life sentences, plus 40 years. Ridiculous!" Ulbricht was found guilty of charges including conspiracy to commit drug trafficking, money laundering and computer hacking. During his trial, prosecutors said Ulbricht's website, hosted on the hidden "dark web", sold more than $200 million worth of drugs anonymously.

Submission + - Trump Pardons Silk Road Founder (nypost.com)

Submitted by databasecowgirl
databasecowgirl writes: President Trump announced Tuesday night that he had granted a âoefull and unconditionalâ pardon to Ross Ulbricht, founder of the notorious dark web site Silk Road.

Submission + - Decentralized Social Media Is the Only Alternative to the Tech Oligarchy (404media.co)

Submitted by Anonymous Coward
An anonymous reader writes: If it wasn’t already obvious, the last 72 hours have made it crystal clear that it is urgent to build and mainstream alternative, decentralized social media platforms that are resistant to government censorship and control, are not owned by oligarchs and dominated by their algorithms, and in which users own their follower list and can port it elsewhere easily and without restriction. [...] Mastodon’s ActivityPub and Bluesky’s AT.Protocol have provided the base technology layer to make this possible, and have laid important groundwork over the last few years to decorporatize and decentralize the social internet.

The problem with decentralized social media platforms thus far is that their user base is minuscule compared to platforms like TikTok, Facebook, and Instagram, meaning the cultural and political influence has lagged behind them. You also cannot directly monetize an audience on Bluesky or Mastodon—which, to be clear, is a feature, not a bug—but also means that the value proposition for an influencer who makes money through the TikTok creator program or a small business that makes money selling chewing gum on TikTok shop or a clothes brand that has figured out how to arbitrage Instagram ads to sell flannel shirts is not exactly clear. I am not advocating for decentralized social media to implement ads and creator payment programs. I’m just saying that many TikTok influencers were directing their collective hundreds of millions of fans to follow them to Instagram or YouTube, not a decentralized alternative.

This doesn’t mean that the fediverse or that a decentralized Instagram or TikTok competitor that runs on the AT.Protocol is doomed. But there is a lot of work to do. There is development work that needs to be done (and is being done) to make decentralized protocols easier to join and use and more interoperable with each other. And there is a massive education and recruitment challenge required to get the masses to not just try out decentralized platforms but to earnestly use them. Bluesky’s growing user base and rise as a legitimately impressive platform that one can post to without feeling like it’s going into the void is a massive step forward, and proof that it is possible to build thriving alternative platforms. The fact that Meta recently blocked links to a decentralized Instagram alternative shows that big tech sees these platforms, potentially, as a real threat.

Submission + - TikTok is censoring anti-Trump content (newsweek.com)

Submitted by smooth wombat
smooth wombat writes: After going dark for 12 hours in response to a U.S. law saying it must divest from Chinese ownership, TikTok came back on line when the new administration took office. However, once up and running, users found one unexpected change. Anti-Trump content is now being censored. Words, phrases, and videos which were readily accessible pre-blackout were now unavailable or being removed entirely.

A post on X, formerly Twitter, which has received 4.5 million views at the time of reporting, claims that "TikTok is now region locking Americans from looking up things like "fascism" and "Donald Trump rigged election"."

The post includes two screenshots of the TikTok app. The screenshot is of the search page, and in both the search term is "Donald Trump rigged election." The post states that: "On the left are results from a device in America, and on the right are results from one in the UK."

The post on the left shows a results page stating "No results found," while on the left it shows two videos of the President.

Another post from the account Dustin Genereux said that, "Censorship on TikTok is at an all time high with accounts being deleted, posts going back years being flagged, people losing access to the creator fund for saying anything Anti-Trump, MAGA, Elon, etc. But free speech and all that right?"
Earth

Great Barrier Reef Hit By Its Most Widespread Coral Bleaching, Study Finds (theguardian.com) 15

Posted by msmash from the catastrophic-developments dept.
More than 40% of individual corals monitored around a Great Barrier Reef island were killed last year in the most widespread coral bleaching outbreak to hit the reef system, a study has found. The Guardian: Scientists tracked 462 colonies of corals at One Tree Island in the southern part of the Great Barrier Reef after heat stress began to turn the corals white in early 2024. Researchers said they encountered "catastrophic" scenes at the reef.

Only 92 coral colonies escaped bleaching entirely and by July, when the analysis for the study ended, 193 were dead and a further 113 were still showing signs of bleaching. Prof Maria Byrne, a marine biologist at the University of Sydney and lead author of the study, has been researching and visiting the island for 35 years.

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