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Astronomy & Astrophysics
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Michael Reid

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Assignment 2 due Tuesday September 27 2011y Stars are balls of plasma which produce energy by nuclear fusion y Plasma is super heated gas highly ionized y Stars produce energy by nuclear fusion at its core unlike planets y Planets are rocky icy or gassy and they dont produce much energy o Terrestrialo Gas Giants mostly liquid not gas Saturn and Jupiter o Ice Giants Uranus and Neptune y In 2006 the International Astronomical Union accepted a new definition of the term planet adding one new criterion to the traditional definition o Planets orbit stars directly not other planets o Planets must be massive enough for their own gravity to compress them into spherical shapes o Planets must have cleared th
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