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  1. #27


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    Quote Originally Posted by Norm View Post
    Einstein never visited a black hole.
    That is true Norm, but I am not entirely sure I believe in black holes yet either lol. Didn't I just read somewhere that scientists just found one that from all previous research says, it was so big that it could not even exist?

  2. #28


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    Quote Originally Posted by Counting_Is_Fun View Post
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    Quote Originally Posted by Norm View Post
    Einstein never visited a black hole.
    That is true Norm, but I am not entirely sure I believe in black holes yet either lol. Didn't I just read somewhere that scientists just found one that from all previous research says, it was so big that it could not even exist?
    In spite of developing the theory (General Relativity) that was used to prove that black holes could exist, Einstein didn't think that they were possible.
    I think it's safe to say that physicists "universally" agree that black holes do exist.
    (I am not a physicist.)

    See: https://www.cosmotography.com/images...evolution.html
    Last edited by 21frogman; 12-13-2019 at 06:48 PM.

  3. #29


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    We had this famous Schwarzschild radius (3 kilometers per sun mass) in Astrophysics lectures when I studied. There was a lecture on star building and evolution, one on supernovae, and a seminar where I once held a talk on x-ray binaries, which consist of a large star (e.g. a Red Giant) and a very compact object (e.g. a White Dwarf, Neutron Star, or Black Hole). Mass flows from the large to the small component, building a so-called "accretion disc", and hits the surface of the small component so hard that x-ray radiation is generated, which can sometimes be measured on Earth, like the rotating beam from a lighthouse. Fascinating subject.
    Last edited by PinkChip; 12-14-2019 at 05:04 AM.

  4. #30


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    Quote Originally Posted by PinkChip View Post
    Fascinating subject.
    I agree. Never took a physics course beyond college basics, but I've been fascinated with the concepts in astro- & particle physics for decades.
    The Great Courses (online) has some excellent lecture series on advanced physics (as well as other topics) and, of course, there are plenty of excellent books for the layman.

  5. #31


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    Wow, my thread has gone to astrophysics.....

  6. #32


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    Quote Originally Posted by ZeeBabar View Post
    Wow, my thread has gone to astrophysics.....
    You may thank Norm for post 26.

  7. #33


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    Quote Originally Posted by ZeeBabar View Post
    Wow, my thread has gone to astrophysics.....
    If you want it to go to Jupiter buy that book and gives us the review.

  8. #34


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    Originally Posted by PinkChip
    Fascinating subject.



    The journal Science has declared the imaging of a black hole by radio astronomers to be the "breakthrough event of the year 2019".
    Last edited by 21frogman; 01-02-2020 at 03:40 PM.

  9. #35


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    Quote Originally Posted by 21frogman View Post
    The journal Science has declared the imaging of a black hole by radio astronomers to be the "breakthrough event of the year 2019".
    Forgot to include a link. https://www.sciencemag.org/news/2019...ar-and-runners

    The report on the black hole is at the end of the video titled "Breakthrough of the year and Runners-up".

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