ASTRONOMY IS TERRIFYING You are sitting on an unstable molten rock, with a weight of approx. 6,000,000, 000,000,000,000,000,000 (6 x 10²⁴) kilograms. And that molten rock, we lovingly refer to as Earth, is spinning at a relative speed of about 1,000 mph about the equator. Yet you are oblivious to this. Your experience is a gentle rising and setting of the Sun, Moon and Stars, day in and day out, on a rock solid foundation.