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Astronomers may have detected a ‘dark’ free-floating black hole
- bufferoverflow 4y agoI hate videos that instead of getting to the point give me all kinds of historical background nonsense. I just wanted to know about this new black hole, I don't need a lecture on something I already know. There are videos for that.
- deleted 4y ago[deleted]
- colechristensen 4y agoI want to see the most interesting part first and then background information afterwards, if I care.
- umvi 4y agoBut then you might stop watching as soon as the interesting part is over
- JacobThreeThree 4y agoComing up right after the break, those details on that new black hole. Stay with us.
- function_seven 4y agoOh god, followed by “welcome back! Before the break we learned about the various types of black holes and paradigms this discovery may turn on their heads. To recap…”
- ninkendo 4y agohttps://www.youtube.com/watch?v=cg4z7mzaVco https://www.youtube.com/watch?v=cg4z7mzaVco
- hinkley 4y agoThe most interesting part of the blackest thing in the universe, surrounded by the second blackest thing?
- pilsetnieks 4y agoParticularly if you're Anish Kapoor.
- Wowfunhappy 4y agoDid we watch the same video? The whole thing is around 90 seconds long.
- m3kw9 4y agoNow one more danger of flying in space: accidentally flying into a black hole
- deleted 4y ago[deleted]
- chowells 4y agoThat seems basically impossible. Black holes are either so small (in diameter) that you'd have trouble hitting them if you tried or so massive they're going to noticeably throw off your navigation well before you reach the event horizon. Or both.
- ars 4y agoAgreed. The gravitational influence of the black hole would be noticed years in advance.
- kekebo 4y agoWhat would be a realistic mitigation strategy if a massive one was on collision course with earth? Besides changing earth's trajectory
- nwallin 4y agoThe least unrealistic mitigation strategy would be to colonize Mars. Note that even a near miss will cause a significant perturbation to orbits in the solar system. It's likely that a black hole passing through the solar system and not hitting anything would still render life on Earth impossible.
- ericbarrett 4y agoEarth even with massive temperature swings from today (due to wacky orbit or whatever) I think Earth would still be more hospitable than Mars. It has a magnetic field and a moon and lots of water. If all the life has died, and the atmosphere has frozen or boiled off, well, you're still no worse off than Mars, and you've still got that magnetic field and aquifers and petrochemicals to get back to space eventually.
- jug 4y agoNothing weird about that per se, but good job if true!
- scotty79 4y agoI'm a fan of explaining dark matter with such objects. Not WIMPs but MACHOs.
- mturmon 4y agoI believe the community consensus (based on surveys) is that there aren't enough microlensing events to explain the amount of dark matter we see, using MACHOs. You can read this even at: https://en.wikipedia.org/wiki/Massive_compact_halo_object https://en.wikipedia.org/wiki/Massive_compact_halo_object I believe that I most recently heard it from Lina Necib's appearance on Sean Carroll's podcast ... that would be this episode: https://www.preposterousuniverse.com/podcast/2020/05/11/96-lina-necib-on-what-and-where-the-dark-matter-is/ https://www.preposterousuniverse.com/podcast/2020/05/11/96-l... Recommended, if you go for that sort of thing. [Edited to add: OK, turns out the consensus is unstable. There appears to be a window of BH mass range which has not been observationally excluded. See, e.g.https://en.wikipedia.org/wiki/Primordial_black_hole#Theoretical_history https://en.wikipedia.org/wiki/Primordial_black_hole#Theoreti...]
- lumost 4y agoI’d be skeptical of such a claim. We have very limited ability to detect dark black holes. The range of possible masses for said black holes is broad if primordial black holes exist.
- mturmon 4y agoOK, the transcript from Sean's show, from 2 years ago, is here: [https://www.preposterousuniverse.com/podcast/2020/05/11/96-lina-necib-on-what-and-where-the-dark-matter-is/ https://www.preposterousuniverse.com/podcast/2020/05/11/96-l...] And here's the relevant part. It's fair to say that Necib is not very bullish on BH's being the explanation for dark matter. (SC = Sean Carroll of Caltech, LN = Lina Necib, then at Caltech, now on faculty at MIT) SC: But it could be black holes, right? LN: Yes it could be primordial black holes. There has been a lot of work, especially recently, on trying to understand what is the possibility or what is the parameter space so if the theory of primordial black holes explaining dark matter is still possible, there is some disagreement within the community of how much of it is ruled out. The theory is not completely ruled out but quite a few chunks of it are. It depends on the measurements and there are some very small windows for example. I think 15 to 30 solar masses is still possible, something like that so it is not a completely ruled out theory. ... SC: [...] Black holes, you seem to be saying, if I can summarize it - if there is some mechanism for making black holes early on, they could be some of the dark matter but it’s hard to make them be all of it. Is that fair? LN: That’s right, yes. It’s much more difficult to make them pure, to make them all completely the dark matter. It could be a small fraction, that has not been ruled out, yes.
- sanatgersappa 4y agolooks like Species 10-C didn't get the message.
- deleted 4y ago[deleted]