Mercury

Even though it currently has temperatures approaching 800 degrees Fahrenheit during the day and nearly -300 degrees at night, a new study suggests there is a small chance that the planet Mercury could have supported life.

Mercury had a rare celestial occurrence Monday, as stargazers saw the planet -- as a small black dot -- pass between the sun and Earth.

Mercury may be in retrograde, but an even rarer celestial occurrence is occurring today will when the first planet in the Solar System passes across the Sun, an event known as Mercury Transit.

It's been known for some time that there are ice deposits on Mercury and the Moon, including frozen water found on the surface of the Moon last year.