The planets Jupiter and Saturn will align on the 21st, creating what some are calling the Christmas star.

NASA says its planet-hunting telescope has found 10 new planets outside our solar system that are likely the right size and temperature to potentially have life on them. As the Kepler telescope finished its main mission, NASA announced Monday that it has seen a total of 49 planets in the Goldilocks zone for possible life. And it only looked in a tiny part of the galaxy. Kepler scientist Mario Perez says that means that "we are probably not alone" because four years of data...

For the first time, astronomers have discovered seven Earth-size planets orbiting a nearby star - and these new worlds could hold life. 

What draws a crowd of astrophysicists, planetarium folk and astronomers together? The transit of Mercury that occurred early Monday morning!

For many people, the start of the New Year is a time to start fresh and make a positive change to their daily lives. 

Mars appears to have flowing streams of salty water, at least in the summer, scientists reported Monday in a finding that could have major implications for the possibility of life on the red planet.

Mars, Venus and the moon will meet up in a particularly beautiful cosmic display starting Friday.