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Point out that the average density of the sun is 1.4 g/cm3 (note that the sun is about 1/20th the mass of a star that would become a black hole). Inform students that as forces are applied to most (non-liquid) substances and they are squeezed into a smaller space or volume, ... And finally down to a ... black hole...
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www.pbs.org/wgbh/nova/teachers/activities/3314_blackhol...
www.pbs.org/wgbh/nova/teachers/activities/3314_blackhol.html
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Any mass, if squeezed down small enough, can become a black hole. To make the earth into a black hole it would have to be squeezed down to a radius of .86 centimeters, about half the size of a golf ball.
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www.pbs.org/wnet/hawking/tguide.pdf
www.pbs.org/wnet/hawking/tguide.pdf
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(If our Sun were suddenly squeezed enough to become a black hole -- a physical impossibility, by the way -- Earth would continue to orbit at its current distance, and would not be "sucked in" by its gravity.) Only very close to the horizon -- a few times the black hole's radius -- do the effects of General Relativity...
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blackholes.stardate.org/resources/articles/article.php?...
blackholes.stardate.org/resources/articles/article.php?p=daring-journey
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If the Earth was compressed to this size, then nothing on it could possibly escape. It would have become a black hole! ... That is, time itself slows down deep in gravitational fields. This effect has actually been measured here on Earth! Of course, on Earth gravity is not nearly as strong, as in a black hole, and so the...
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www.adlerplanetarium.org/education/resources/gravity/9-...
www.adlerplanetarium.org/education/resources/gravity/9-12_cb1-2.shtml
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If the Sun were to become a black hole, it would have to be squeezed into a radius of 3 km. ... Also, Harvard physicist Lene Hau has slowed down light in her laboratory down to every-day speeds. It may be possible to build a "black hole" on your desk-top with special slow-moving light!)
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www.bramboroson.com/astro/apr17.html
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If you squeezed the earth down to a body with a radius of 2,000 miles, the same object on the earth would experience a greater gravitational force because the centers of the two masses would be ... If you squeezed the earth into the density of a black hole, ... you mean thet every object in this world can become a black hole.
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www.physicsforums.com/archive/index.php/t-195502.html
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If the collapsing star manages to hold on to a critical amount of mass, no force in the Universe can halt its contraction and, in a fraction of a second, the material of the star is squeezed down into the singularity of a black hole. ... In theory, any mass if sufficiently compressed would become a black hole.
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www.daviddarling.info/encyclopedia/B/blackhole.html
www.daviddarling.info/encyclopedia/B/blackhole.html
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5. If the sun were to be replaced by a one solar mass black hole, the gravitational pull of the black-hole sun upon the Earth would be: ... 8. The Earth would have to be squeezed down to what radius to become a black hole?
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sem.cypresscollege.edu/~astronomy/courses/astr116/homew...
sem.cypresscollege.edu/~astronomy/courses/astr116/homework/version_b/116hw13b.htm
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When a decorated Marine goes missing overseas, his black-sheep younger brother cares for his wife and children at home—with consequences that will shake the foundation of the entire family. ... 6. We still kills hundreds of Taliban and AQ but bin Laden slips off to become a ghost.
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www.blackfive.net/
www.blackfive.net/
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