This article draws connections between Mars and Earth, focusing on three major puzzles: Martian volcanoes, martian river valleys, and Martian magnetic fields.
"In some ways Mars is strangely like Earth. It rotates in 24.6 hours and is tilted on its axis by 24 degrees, almost exactly the same as Earth. Its orbit wanders away from and toward the sun as much as Earth's does, giving Mars a range of climate rather similar to Earth, though much colder."
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