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OFF-TOPIC First image of a black hole

Discussion in 'Off Topic: Sports, Funnies, Pop-Culture' started by lowtek, Apr 10, 2019.

  1. lowtek
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    lowtek Platinum Contributor Read Millionaire Fastlane FASTLANE INSIDER Speedway Pass Summit Attendee

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    We've managed to directly image the event horizon around a black hole, using a planetary network (with one part here in Arizona) of radio dishes.

    While you may have heard the term in pop culture, let's make sure our definitions are straight. The event horizon is the boundary between two regions of space-time, typically associated with a black hole. "Inside" the event horizon, space-time is so warped, due to the massive gravitational field of the black hole, that the escape velocity is greater than that of light. Outside, the escape velocity is quite high, but less than that of light, so matter and energy can eventually escape.

    As dust and debris fall into the black hole, it accelerates. Charged particles radiate light as they accelerate, and this results in the presence of a bright disk around the event horizon.

    This is precisely what we have imaged for the first time in history. A bright disk of infalling matter around the supermassive black hole at the center of M87.

    https://phys.org/news/2019-04-astronomers-unveil-photo-black-hole.html
     
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  2. PizzaOnTheRoof
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    PizzaOnTheRoof Burger Rotation Specialist Read Millionaire Fastlane I've Read UNSCRIPTED FASTLANE INSIDER Speedway Pass

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    That's an amazing photo. Can't wait for James Webb to finally launch!
     
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  3. MJ DeMarco
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    MJ DeMarco Raving Lunatic Staff Member Read Millionaire Fastlane I've Read UNSCRIPTED FASTLANE INSIDER Speedway Pass LEGENDARY CONTRIBUTOR Summit Attendee

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    Mind-boggling, and it took a telescope the size of the earth to see it.

    On another tangent, here's another picture of a black hole.

    [​IMG]


     
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  4. socaldude
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    socaldude Platinum Contributor Read Millionaire Fastlane FASTLANE INSIDER Speedway Pass

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    Is it true that some black holes are actually "topologically" connected that they are actually one and the same black hole but light years apart because they don't "occupy" space-time?
     
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  5. lowtek
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    lowtek Platinum Contributor Read Millionaire Fastlane FASTLANE INSIDER Speedway Pass Summit Attendee

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    Not sure, but it sounds like some woo to me. Black holes are definitely distinguishable, due to their mass, angular momentum, and charge... They're probably all topologically equivalent, but that doesn't imply they are connected any more than the fact that a donut and a coffee mug are topologically equivalent.

    I'm just a humble experimentalist in condensed matter, rather than cosmology or the like. A quick google search didn't reveal any peer reviewed articles supporting the assertion, so I'm going to go with a no.
     
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  6. Xeon
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    Xeon All Cars Kneel Before Pagani. Read Millionaire Fastlane I've Read UNSCRIPTED Speedway Pass

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    Now I just need scientists to confirm findings as to what happens to things who go into black holes since space time is so warped inside. How warped?

    Do things get erased out of existence or are they the portal to new dimensions? Hurry up NASA!

    What an architectural beauty!
     
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  7. lowtek
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    lowtek Platinum Contributor Read Millionaire Fastlane FASTLANE INSIDER Speedway Pass Summit Attendee

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    Check out this video by PBS Spacetime. Best science channel on YT, IMHO.


    View: https://www.youtube.com/watch?v=mht-1c4wc0Q
     
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  8. 404profound
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    404profound Gold Contributor I've Read UNSCRIPTED Speedway Pass

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    Word on the street is if you get too close your ability to think logically can't escape its event horizon, and you'll not return from a mindset of nepotism and hierarchical circle-jerking. I'd rather fall into M87.
     
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  9. 404profound
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    404profound Gold Contributor I've Read UNSCRIPTED Speedway Pass

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    What most people don't realize is that photo is a representational state from 55 million years ago, and doesn't reflect current reality. I wonder what the state of the hole is today.
     
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  10. scottmsul
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    scottmsul Bronze Contributor Read Millionaire Fastlane I've Read UNSCRIPTED FASTLANE INSIDER Speedway Pass

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    I took a GR class back in grad school, I recall learning that if a black hole has high enough spin, it's possible to form closed time-like curves outside the event horizon...meaning it's possible to go back in time. I was (and still am) extremely skeptical of this, I feel like I either misinterpreted this fact, or maybe GR breaks down at those scales.

    I also feel like I never fully understood the event horizon. For example if an object falls into the black hole, an observer at infinity will see the object approaching the event horizon forever but never cross it. But in the reference frame of something falling into the black hole, they cross the boundary and hit the center in a finite amount of time. But we know from Hawking radiation that black holes slowly evaporate over time, so wouldn't the observer at infinity see the black hole evaporate before the person falls in? And therefore, in the frame of falling into the black hole, wouldn't the black hole seem to evaporate really fast before you get the chance to fall in? But I recall my professor was very adamant that the person falls in before the black hole evaporates.
     
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  11. lowtek
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    lowtek Platinum Contributor Read Millionaire Fastlane FASTLANE INSIDER Speedway Pass Summit Attendee

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    Check out the video I linked above. PBS Spacetime does great work exploring all this stuff.
     
  12. Siddhartha
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    Veritasium had a great pair of videos on this.
    Scientists have also produced some more detailed simulaton images from the data that will probably be bang on until we have a telescope system large enough to capture m87 in detail:
    [​IMG]

    I find this whole situation interesting; because the original mission was to capture data and render an image of the black hole at the center of our galaxy, but that was hard to capture. So instead, scientists went and found a black hole many, many times further away weighing 6.5 billion times the weight of the sun and with a swarzchild radius the size of the solar system (unimaginably huge) and captured an image of that instead.

    For sense of scale, blob in bottom half is the best quality image of the black hole until now:
    [​IMG]
     
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