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Gravitation, the universal attractive force, acts upon all matter (andradiation) relentlessly. Left to itself, gravity would pull everything togetherand the Universe would be nothing but a gigantic black hole. Nature throwsalmost every bit of physics - rotation, magnetic field, heat, quantum effectsand so on, at gravity to escape such a fate. In this series of articles weshall explore systems where the eternal pull of gravity has been held off byone or another such means.

Gravity Defied (from potato asteroids to magnetised neutron stars) I : The self-gravitating objects