Are blackholes formed in other ways besides supernovas?

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In summary, black holes can be formed in nature through various processes, including the collapse of a massive star after a supernova, the merging of two neutron stars, accretion onto a white dwarf or neutron star, and the possibility of primordial black holes formed in the early stages of the universe. There is still debate and uncertainty around the details of these formation processes. Additionally, it is important to note that black holes do not explode in a supernova, but rather the remnants of a supernova can result in a black hole.
  • #1
mdmaaz
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In science books I always have read that supper massive black holes explode in a supernova once they run out of fuel. After that the core of the star collapses and forms a black hole. But are there other ways in which black holes are formed in nature, besides the the core of a big star collapsing after a supernova?
 
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  • #2
mdmaaz said:
In science books I always have read that supper massive black holes explode in a supernova once they run out of fuel. After that the core of the star collapses and forms a black hole. But are there other ways in which black holes are formed in nature, besides the the core of a big star collapsing after a supernova?

There are monster black holes in the middle of most galaxies which seemed to have formed directly with gathering lots of gas and dust.

Also, we aren't sure about the details of the supernova/black hole relationship. The consensus seems to be that if you have a big enough star, it will go directly to a black hole without a supernova. However, where that boundary is, and if you can get a star go boom and then form a black hole is quite unclear.
 
  • #3
IIRC, if two neutron stars merge, the sum could be enough for a black hole to form.
 
  • #4
Accretion onto a white dwarf of neutron star can cause it to gain enough mass to collapse into a black hole. (Though the white dwarf would first collapse into a neutron star)
 
  • #5
Also, primordial black holes, formed in the early stage of the history of the universe, might exist. Primordial black holes are not the result of the gravitational collapse of a pre-existing massive star, but were mainly created in the extreme conditions after the Big Bang. They might be of any size and some might be detected thanks to their Hawking radiation emission. See here http://en.wikipedia.org/wiki/Primordial_black_hole.
 
  • #6
mdmaaz said:
In science books I always have read that supper massive black holes explode in a supernova once they run out of fuel. After that the core of the star collapses and forms a black hole. But are there other ways in which black holes are formed in nature, besides the the core of a big star collapsing after a supernova?

No, you have the first part of that statement backwards ... black holes don't explode in a supernova, STARS explode in a nova or supernova and the remnant of a supernova explosion can be (may always be, I'm not sure) a black hole. This IS what you're saying in the second part of your statement.
 
  • #7
Accretion induced collapse is another hypothesis. Where a binary system made of two w.d(oxygen-magnesium) results a black hole.Essentially one of them goes onto become a red giant and other sucks in/accretes the less dense gases towards it.This drives further gravitational collapse which in a chain of events forms a neutron star.Once the Chandrasekhar limit is surpassed you end up with B.H however I have also read that a collapsed driven type 1A supernovae is also formed at that instant.
Other than that your usual transition of a B.H is by type II supernovae and ones mentioned by posters(above).
-ibysaiyan
 

1. How are blackholes formed?

Blackholes are formed when a massive star dies and its core collapses under its own gravity. This causes an intense gravitational pull that becomes so strong that even light cannot escape, creating a blackhole.

2. Are blackholes only formed from supernovas?

No, blackholes can also be formed through other processes such as the collision of two neutron stars or the merging of two smaller blackholes. These events are known as gravitational wave events.

3. Can blackholes be formed in other ways besides stellar collapse?

Yes, blackholes can also be formed from the collapse of large clouds of gas and dust, known as primordial blackholes. These blackholes are thought to have formed shortly after the Big Bang.

4. Are there any other theories about how blackholes are formed?

Some scientists have proposed alternative theories such as the collapse of cosmic strings or the collapse of a bubble of false vacuum. However, these theories are still highly debated and not widely accepted.

5. Can blackholes also be formed artificially by humans?

No, blackholes cannot be formed artificially by humans. The conditions required for the formation of a blackhole are extremely rare and can only occur in natural phenomena, such as the collapse of massive stars.

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