Earth rise as seen from the moon duringÂ Apollo 8, Â NASA:15 Facts About Our Planet for Earth Day
Today -- Earth Day -- is a time to take stockÂ of the plant where we live, reports Phil Plait on today's Slate.
It's easy to take Earth for granted, Plait wrote, since we see it every day.
It becomes -- and is -- part of life's background, he said.
But when you see the world through the eyes of science, nothing is mundane.
Here are some interesting Earth Day facts to ponder about the planet today: http://www.slate.com/blogs/bad_astronomy/2013/04/22/earth_day_15_facts_about_our_planet.html