Earth is our home planet, and it's the only place in the universe ... it holds as much water as all five North American Great Lakes combined. Marilyn Perkins is the content manager at Live Science.

The best opportunity to potentially see all seven planets is coming up on Feb. 28 around 6:10 p.m. ET, according to Shanahan. Mercury, which is the closest planet to the sun, would be the first to be ...