Pale green dot. The oceans were likely once a vibrant green color between 3.8 and 1.8 billion years ago, according to a study published in the journal Nature Ecology & Evolution.During this period ...

A planet that defies expectations. Mercury has long fascinated Carnegie scientists. In 1903, the institution's Year Book noted that "observations of Mercury are much wanted." ...

How to see Mercury, the moon and the Gemini twins pass close together in the night sky this week See Jupiter pair up with a sliver of the moon tonight Don't miss the crescent moon cozy up to ...