If you're an avid skygazer, you may have noticed two bright objects, Venus and Jupiter, shining in the night sky this week. Now, a third planet is due to join the cosmic fun. That's right, Mercury is ...

Add Yahoo as a preferred source to see more of our stories on Google. That's right, Mercury is on its way to a sky near you, where it will turn a two-planet conjunction into a full-on planet parade.