Arctic river erosion linked to permafrost thaw

Permafrost, the thick layer of perennially frozen ground that covers much of the Arctic, slows down the migration of Arctic rivers, according to a new Caltech study. River migration is a common process in which a river's ...

Fifteen years later, scientists locate a lunar impact site

In 2009, NASA intentionally crashed a spacecraft into the moon and used a small trailing spacecraft to observe the results: The Lunar Crater Observation and Sensing Satellite (LCROSS) was designed to search for frozen lunar ...

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