Mercury doesn't give up its secrets easily. The smallest planet in our solar system is also one of the most extreme—a sun-scorched, metal-rich world with a puzzling magnetic field and lavas unlike ...

Although Mercury was geologically active in its early days, today its surface appears almost completely static. This is why it is often perceived as a dead and dry planet. A new study led by Dr.

Add Yahoo as a preferred source to see more of our stories on Google. Floridians who are avid skygazers may have noticed two bright objects, Venus and Jupiter, shining in the night sky this week. Now, ...