Mercury occurs naturally in minerals but usually isn't released into the air, where it can become harmful to humans. It is released and enters the atmosphere when coal, garbage and other items are ...

Add Yahoo as a preferred source to see more of our stories on Google. Mercury, the closest planet to the sun, is only slightly larger than Earth's moon and is pockmarked with craters. The planet is ...

Mercury will be visible this December. This means that space fans will have a Christmas treat for their eyes. How to See Mercury This December? Here's a Christmas Treat for Your Eyes Photo grab from ...