Does Earth belong to the first generation of habitable planets in the universe? One astrophysicist's work suggest it's possible, although we may never know for sure.
It's a virtual certainty that comets have delivered the building blocks of life to Europa's hidden ocean, according to a new study.
Observations by NASA's MAVEN Mars orbiter suggest that shooting stars lit up the Red Planet's skies after the close flyby of Comet Siding Spring this past October.
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