It may seem strange to begin a site about the mysteries of physics with a chapter on motion. After all, moving is something we do every day, all of the time. It doesn’t usually seem very mysterious. You may think that you are sitting still right now, staring at your computer, possibly with your legs propped up on the corner of your desk or a small, obedient child.
But that is not the case. In fact, just beneath you there is a fantastically large piece of rock which is spinning around in space. Being on the surface of this hunk of rock, you are moving with it — at speeds of up to 1,674 kilometers per hour (or 1,040 miles per hour). That is a few hundred kilometers per hour faster than the speed of sound.
And the planet does more than just spin — it’s also orbiting the sun. It may take a while to complete one full orbit (one year), but in that time it has gone a long way — almost a billion kilometers. We’re moving around the sun at a speed of over one hundred thousand kilometers per hour.