Scientists, Students Use Trio Of Spacecraft To Study Craters

Credit: NASA/Johns Hopkins Applied Physics Laboratory/Carnegie Institution
Craters are ubiquitous in the inner Solar System. They exist on Earth, where they are obscured by erosion, and on the rocky (and icy) moons of the outer planets. Some are ancient—products of the period of “heavy bombardment” 4.1 to 3.8 billion years ago, when the planetary disk of debris around the...

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