Earth's spin, of course, is not the only motion we have in space. Our orbital speed around the sun is about 67,000 mph (107,000 km/h), according to Cornell . We can calculate that with basic ...

Instead, these enlightened people see themselves and all humans as fellow citizens of one world – travelling on the same planet spinning through space. For some, these revelations extend well ...

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 ...