Scientists show how terrain evolves on an icy comet

With an eye toward a possible return mission years in the future, Cornell astronomers have shown how smooth terrains—a good place to land a spacecraft and to scoop up samples—evolve on the icy world of comets.

If Europa has geysers, they're very faint

In 2013, the Hubble Space Telescope spotted water vapor on Jupiter's moon Europa. The vapor was evidence of plumes similar to the ones on Saturn's moon Enceladus. That, and other compelling evidence, showed that the moon ...

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