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  • Neptune is freezing. Mars is warm
  • Neptune is blue. Mars is red
  • Neptune is a gas giant. Mars is a solid planet
  • Neptune is not capable of supporting life. Mars can theoretically support a human colony
  • Neptune has 13 moons. Mars has 2 moons
  • Neptune has rings. Mars has no rings
  • Neptune is large. Mars is small
  • Neptune's atmosphere is composed of helium, hydrogen and methane. Mars's atmosphere is composed of carbon dioxide, nitrogen and argon with small traces of oxygen and methane
  • Neptune has ice. Mars has small traces of water
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13y ago

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