How does a black hole form in the middle of nowhere?

By | November 29, 2012
Very strange discovery: A black hole without a large surrounding amount of matter. So how did it form, and how does it maintain it's 'stable' state? Looks like we'll be seeing some interesting explanations coming out of the Astronomy corner sometime soon.

/via +Jenny Winder 

Bizarrely big black hole baffles
Astronomers spot the second-largest black hole ever seen, but in a tiny galaxy just a quarter the size of the Milky Way.

7 thoughts on “How does a black hole form in the middle of nowhere?

  1. Francois Demers

    There are tidal effects and there should be gravity waves (undetected so far).
    Tidal effect:if you were to enter the event horizon of a BH feet first, your feet would feel a much stronger pull of gravity than your head. Don't try this at home: you would be torn apart.

    Gravity waves: it is expected (not demonstrated) that gravity is a function of a subatomic particle tentatively named the gravitron. If it exists, the gravitron is a bit like a photon: it behaves like a wave. 

    My fight with Pr. Hawing was about "How come gravity can escape a black hole? Huh? Huh?" Pr. Hawking has an email address and you can ask him questions.
    One of his assistants replied (several times) "Professor Hawking is a very busy man and cannot answer grade-school physics questions
    I replied (several times) "Just admit you don't know or answer the question How come gravity can escape a black hole? Huh? Huh?
    A few rounds later, the assistant replied "Sod off!"

    I have not heard from Hawking since. I still want my umbrella returned.

  2. Francois Demers

    +Sophie Wrobel I am no longer on speaking terms with Pr. Hawking but, from my notes, the size of the gravitational lens of a black hole is a function of its mass. The more massive, the larger the event horizon. You can also measure its entropy by the size of its event horizon.

    So this one is not a mini. It could be a big primordial or it could be what is left of a very large mass (say, a galaxy) after it implodes. NGC 1277 would be what is left. Possibly its core collapsed and the observable part laid outside the event horizon. Speculation obviously.

    Dr Van den Bosch says NGC 1277 is "very old". It fits one of the models: with time, the black hole at the core of a galaxy eats the galaxy away.As the galaxy's spin slows down, more matter gets pulled into the central black hole.

    +Gurudatta Raut a typical supernova is a side effect of one star collapsing into one black hole. You get pretty good fireworks when a star collapses into a white dwarf or a neutron star too. These events are very "hot" and release a lot of energy, some of it in the visible spectrum.

  3. Francois Demers

    From memory (and Stephen Hawking's A Brief History of Time)

    Primordial black holes could have been formed just after the Big Bang if matter and energy were not distributed evenly just after the BB.

    Matter and energy were not distributed evenly: if they had been, the universe today would be an evenly distributed soup.

    As those primordial black holes would be among the first object created, they could be almost incredibly massive; they also would have time to evaporate a little. They need about 300 billion years to evaporate completely (fact check needed here: I could be forgetting quite a few zeroes).

    Mini black hole are not hyper-massive: you could make one out of a very small object such as Mount Everest. All you have to do is compress it until is density is high enough that its surface gravity prevents light from escaping it. Those could also have been formed during the Big Bang. What is fascinating is they can be made.

    If you find one, call me, don't touch it.


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