The Hubble is a satellite. It orbits the Earth very quickly, completing one revolution every 97 minutes. This means the Hubble moves a speed of about 5 miles per second, or 18,000 miles per hour! When the Hubble observes distant stars and galaxies, it must stay pointed in the same direction for hours at a time. In addition, it must remain stable while fighting the effects of the Earth’s gravity and the solar wind.
