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By spectrum of elements of that planet.
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so you have a face book id
sorry but i rarely visit fb.
what is your id
r u there
Ya there r no atmosphere in space but..... where there is heavy mass, like in stars, the quarks n leptons in space r fused to form electtons p r otons n neutrons. the 1st element that can be formed is hydrogenn helium n further.... due to its gravitataional pull msny other bo df ies start revolving around the star, when some bodies hit the stars the radioactive elements scattered n slowly this is how all elements r formed dude..... including gases
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