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The newest mission to Mars is to launch on Saturday morning. It will search for marsquakes and try to produce a map of the planet’s insides.

Earth is about 29 percent land and 71 percent oceans.

Earth-like worlds with similar land-to-ocean ratios to our planet's may be exceedingly rare. Instead, our search for habitable worlds should focus on land-dominated 'pale yellow dots.'

Government Executive Get the latest on need-to-know topics for federal employees delivered to your inbox. email The Simple Task That Mars Made Impossible NASA spent nearly two years trying to wrangle a probe designed to burrow into the planet’s soil. Troy Hudson didn’t want to think about Mars. It was Christmas, he had taken some time off, and this planet had enough going on at the end of 2020. But Mars was difficult to escape, he told me. It twirled in a mobile of the solar system in his home. It sat right there on his skin, tattooed on his arm, below the elbow. Hud...

The Simple Task That Mars Made Impossible Marina Koren © NASA Troy Hudson didn’t want to think about Mars. It was Christmas, he had taken some time off, and this planet had enough going on at the end of 2020. But Mars was difficult to escape, he told me. It twirled in a mobile of the solar system in his home. It sat right there on his skin, tattooed on his arm, below the elbow. Hudson had spent more than a decade working on a robot that was currently parked on the surface of Mars, and NASA was about to decide whether to give up on it.