2006-09-28 10:10:40 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
Many answered about a super star transforming in to a black hole. There is an issue with this.
The gravity is proportional to mass. Not the density. When a star dies the density increases but not the mass. So the gravity can not increase. So it could not have been transform in to a black hole. Several such stars join to gether can make a black hole or the dead star should scavange for mass all over space and become a black hole
2006-09-28 11:54:31 · answer #1 · answered by Dr M 5 · 1⤊ 1⤋
Stars will either explode at the end of their lives (supernova), or they will contract and settle into a long sleep. What they contract to depends on the mass of the star. If it is not too massive, they collapse to a brown dwarf. They can also become neutron stars, and the ultimate collapse, with very massive stars, is a black hole, where all the mass of the star collects into a tiny tiny ball of quarks and other elementary particles.
2006-09-28 17:24:22 · answer #2 · answered by powhound 7 · 0⤊ 0⤋
Black holes are formed from collapsing stars. As the star implodes it pulls everything around it into its gravitational fields. This matter reaches the speed of light at the center of the collapse, disappearing from our universe.
2006-09-28 17:16:08 · answer #3 · answered by surtrav3 2 · 0⤊ 0⤋
True, gravity depends on mass, not density. But remember that it also depends on the distance. For example the radius of Sun is about 700,000 kilometers. If it became a blackhole, it would collaps to around 3 km. If you happened to be on the "surface" of that blackhole, the gravitational force pulling you in would be about 55 billion times (700,000^2/3^2) stronger than the force you would be affected by around the surface of the Sun.
This would be a truly enormous force - no need to add any extra mass - that of Sun alone would be quite enough.
2006-09-28 22:00:29 · answer #4 · answered by n0body 4 · 0⤊ 0⤋
When gravity in the center of an imploding, or collapsing star gets great enough the atomic forces that keep quarks and things together are overcome. Since those forces propagate at the speed of light they don't work once gravity is strong enough to keep light or nuclear forces from working. And gravity is definitely affected by density.
There is no actual inside to a black hole. Once you're at the point where light can't escape, space itself doesn't exist as we know it any more.
2006-09-28 19:06:49 · answer #5 · answered by Nomadd 7 · 0⤊ 2⤋
Formed when the largest of large stars implodes on itself usually after a Supernova.
2006-09-28 17:20:40 · answer #6 · answered by zz56zz56 3 · 0⤊ 0⤋
It's been a long time since I took astonomy but here goes .... when a star implodes, it contracts in on itself and becomes very compact. The debris is very magnetic.
2006-09-28 17:14:32 · answer #7 · answered by Anonymous · 0⤊ 0⤋
by a large star imploding itself
2006-09-28 17:12:24 · answer #8 · answered by ~CS~ 4 · 0⤊ 0⤋
when a star dies there is a nova or a super nova that sometimes causes a blackhole but not always
2006-09-28 18:25:58 · answer #9 · answered by Anonymous · 0⤊ 0⤋
someone pulled the cork out
2006-09-28 19:01:00 · answer #10 · answered by gary c 1 · 0⤊ 1⤋