Black Holes

Black Holes: When a star with a mass more than 20 times that of the Sun explodes as a supernova, it may leave behind a core so massive that even a neutron star is not its final state. The object's gravity may be so great that it goes on collapsing for ever, crushing the matter within it to an unimaginable state. As the object's density gets greater and greater, the force of gravity rises even more until nothing can escape — not even light....

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Stars

Stars: Stars form from gigantic clouds of gas and dust which are scattered throughout the spiral arms of our galaxy and in other galaxies. Many of these clouds appear to be dark. One such dark cloud is the Coal. Sack nebula in the constellation_ of the Southern cross. A cloud starts to form into stars when it becomes dense enough to collapse under the inward pull of its own gravity. As the cloud falls together, it separates into knots and clumps,...

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