We know it takes 3651/4 days to make one revolution around the sun. We call that a year. It's a long ways to go, especially when you consider that our orbit is oval-shaped. The speed may astound you.

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to [email protected]. Why can’t we feel the Earth moving? – Dave H., ...