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Can a planet become a star?

  1. Oct 21, 2004 #1


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    Would it be possible for a planet by collecting gas to become a star. I mean if it were to collect enough hydrogen, the temperature and the pressure at the surface of the planet could get high enough to start fusion ?
  2. jcsd
  3. Oct 21, 2004 #2


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    The minimum mass required for spontaneous fusion is about 10^28 Kg [around 20x the mass of Jupiter]. Assuming the composition is amenable to fusion [lots of hydrogen], the core would ignite once the former planet accumulated the necessary mass.
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