it's a zone of the universe with so much gravity, that nothing escapes, not even light.
2006-10-19 07:37:14
·
answer #1
·
answered by Peter pan 6
·
0⤊
0⤋
A sufficienly large body where the density> 3c^2/(4pixrxG) The escape velocity would exceed c, hence 'black'.(r=radius, G=grav constant, c=speed of light). For a neutron star the gravitational force would 'squeeze' the particles ever closer. Being Fermions, the Pauli exclusion principle applies. Calculating the probability of their position over the available space would yield zero. Hence the 'singularity' at the centre of this black hole.For sufficienly massive galactic black holes, I think this need not apply. According to Hawking, black holes leak energy when a positron/electron pair are created one particle is absorbed, the other escapes. The borrowed energy for the particle/pair creation is 'deducted' from the black hole's account, so it shrinks. When an electron's mass is converted to energy as a gamma ray photon, the characteristic energy 'signature' is .512Mev, which can be the detected and located by x-ray telescopes.
2006-10-19 22:46:30
·
answer #2
·
answered by troothskr 4
·
0⤊
0⤋
It's what astronomers call the mater (or anti-mater) left after a supernova explosion. This is,when a star, like our sun, dies and explodes it leaves only a dark space of unknow matter.
There are a lot of theories on black holes. The most famous ones are it is made of antimater - which is the kind of thing that cancels or erases matter - and it could be a portal for time travel.
Whatever they are it's still not completely clear.
We know that they contain a massive energy due to its massive density. This density is bigger than the space that contains it, making it a paradox which is still left uncovered.
The current advice is stay away from Black Holes,because their gravity force is so huge they'd drag you into them like a StarTrek's Shuttle.
Don't you just love astronomy and the unknown? :)
2006-10-19 14:46:38
·
answer #3
·
answered by The_4ox 2
·
1⤊
0⤋
If you get some matter close together, it pulls itself closer together by gravity. That stops when atoms are packed as close as they can go. But if you add even more matter, the atoms get scrunched together. Electrons combine with protons to form neutrons. Then you have a ball of solid neutrons, a "neutron star". Adding even more matter will scrunch the neutrons into each other . When that happens the resulting force of gravity from the matter is so strong that light cannot escape. That's a "black hole". We know they exist in space, because we see the radiation emitted as they suck down even more matter by their gravity, before that matter disappears into the black hole.
2006-10-19 15:03:19
·
answer #4
·
answered by Bob 7
·
0⤊
0⤋
A black hole is an object predicted by general relativity with a gravitational field so strong that nothing can escape it — not even light.
A black hole is defined to be a region of space-time where escape to the outside universe is impossible.
2006-10-19 14:40:25
·
answer #5
·
answered by BigEyedFish 6
·
0⤊
0⤋
A black hole is a highly dense matter weighing million times of that of sun and million times smaller thus is supposed to be a very dense matter. it is spinning at enormously high speeds and has unbelievable gravitational pull thus it sucks in every thing within its grasp even light that it receives is unable to get reflected back.
2006-10-19 14:44:31
·
answer #6
·
answered by avneesh 1
·
0⤊
0⤋
It is the place where the time stands still. It is also known as a singularity, because all the laws of physics breakdown at this place.
2006-10-19 14:44:29
·
answer #7
·
answered by Anonymous
·
0⤊
0⤋
It's a name given to something the scientists don't understand but they aren't going to let you know how much guessing goes into their theories. it's called blinding with science.
2006-10-19 16:41:43
·
answer #8
·
answered by bo nidle 4
·
0⤊
0⤋
a black hole is a star collapsing in on istelf and is somtimes known as a super nova. it sucks everything into it and squashes it to nothing, nothing can be safe form a black hole.
plus it is also a ride at alton towers.
2006-10-19 15:12:49
·
answer #9
·
answered by welshwife 4
·
0⤊
1⤋
a black hole is a hole with no light ,rather desturbing if it turns up in your sink if you mean the astronumerical meaning of a black hole its where matter has collected in such density that it collapses on itself creating a vacume that sucks.............everything and anytrhing into it
2006-10-19 14:49:24
·
answer #10
·
answered by alpha 1
·
0⤊
0⤋