November 23, 2018
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What Two Planetary Siblings Can Teach Us About Life
This composite image of Earth and Mars was created to allow viewers to gain a better understanding of the relative sizes of the two planets. Image credit: NASA/JPL-CaltechMars and Earth are like two siblings who have grown apart.
There was a time when their resemblance was uncanny: Both were warm, wet and shrouded in thick atmospheres. But 3 or 4 billion years ago, these two worlds took different paths.
We may soon know why they went their separate ways. NASA's InSight spacecraft will arrive at the Red Planet on Monday, Nov. 26, and will allow scientists to compare Earth to its rusty sibling like never before.
