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Activity on Planets Suggests Youth

Can these processes really have gone on for billions of years?

Mars Rivers Carved by Lava, Not Water

A controversial theory is being revived: lava carved Mars channels. This could discourage hopes to find life on the red planet.

New Craters Found on Mars

Orbiters can count new craters forming on Mars, refining cratering rates. One spectacular new crater has appeared since 2010 with vivid rays.

Fresh Impacts Viewed on Mars, Moon

New impacts observed on the moon and Mars allow space scientists to learn about crater formation in near real time. What conclusions can be drawn?
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