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    • What is a light-year? - NASA Science

      NASA· 6 days ago

      Based on the deepest images obtained so far, it’s one of about 2 trillion galaxies in the observable universe. Groups of them are bound into clusters of galaxies, and these into superclusters ...

    • Why Venus is so dry

      Why Venus is so dry

      Popular Science via Yahoo News· 6 hours ago

      The planet Venus is dry thanks to water loss to space as atomic hydrogen. In this illustration of the dominant loss process, an HCO+ ion recombines with...