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Why Earth is like a magnet? how can earth attract any object irrespective of what it is made of? What is the reason behind Celestial Body's gravity? i.e Sun,Jupiter,Moon etc.

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    $\begingroup$ Have you even looked at any online references, even wikipedia? $\endgroup$ – Jeremy Mar 17 '14 at 21:52
  • $\begingroup$ Gravity is like electromagnetism (magnetism and electrostatic force) one of the four fundamental forces, the other two apply to subatomic particles. Gravity is caused by mass (or more general by energy). $\endgroup$ – Gerald Mar 18 '14 at 18:31
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Any object's mass warps the space around it towards the center of the object which causes other objects to 'fall' in towards that object or towards each other. Bigger objects have more mass therefore they warp space to higher degree causing more gravity. It doesn't matter what a substance is made of as long as it has mass. If it has mass it causes gravity.

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Since you're wanting to know why mass causes gravity (from your question marked as duplicate https://astronomy.stackexchange.com/questions/1988/how-does-an-astronomical-objects-mass-make-it-attract-the-things-around-it) I'll give a little better of an explanation. Since the discovery of Higgs particle last year--which I'm sure you've heard about--if not here's a link http://en.wikipedia.org/wiki/Higgs_boson, we've essentially confirmed that mass is caused by a fundamental particle called the Higgs boson. I think this article may actually answer your question http://physics.aps.org/articles/v6/111. I'm a mathematician not a physicist so I'm not an expert in this area but hopefully the other article can help answer your question better.

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    $\begingroup$ Your answer is helpful $\endgroup$ – Praveen Kadambari May 7 '14 at 6:37
  • $\begingroup$ "mass is caused by ... the Higgs boson" is at best a partially true oversimplification, and qualifying it enough to make it correct would make it nigh-irrelevant to gravity, because only a tiny amount of the mass of ordinary objects is due to the Higgs. It's of dubious relevance anyway, because the gravitational charge is energy rather than mass. $\endgroup$ – Stan Liou Mar 14 '16 at 18:26

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