How much do you really know about our giant blue ball? In honor of Earth Day, which is today, here are some interesting facts about the only planet anyone of us have ever known.

We know we aren't the only planet in the universe capable of housing life, but we are the only one we know about. So instead of looking towards the infinite beyond, let's take stock of what we have and be thankful it isn't stranger than it is.

So put on your shocked faces, because you're going to need them.