News Nation at NASA
News Nation Bureau 17 April 2016, 09:49 PM
A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because no light can get out, people can't see black holes. They are invisible. News Nation explores the NASA station to know the truth about Black Hole.
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