Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury. In English, Mars carries a name of the Roman god of war, and is often referred to as the "Red Planet" because the reddish iron oxide prevalent on its surface gives it a reddish appearance that is distinctive among the astronomical bodies visible to the naked
eye.
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Though once big enough to swallow three Earths with room to spare, Jupiter’s Great Red Spot has been shrinking for a century. A new study suggests that it hasn’t all been downhill, though.
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