NASA
Answer questions like ...
- Earth is the only body in the solar system thought to have oceans of liquid water.
- Earth and Venus are rocky planets of about the same size, but Earth's average surface temperature is about 59° F, while Venus' is 1,350° F, hot enough to melt lead or aluminum. Why the difference?
- Earth is smack in the middle of the "habitable zone" around the sun, where temperatures are right for liquid water to exist.
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