# Space Fact #6

/To get into low Earth orbit—a path in which the forces of motion balance the pull of gravity—a rocket has to attain a speed of about 17,000 miles per hour. To escape the Gravity Well, a vehicle must go about 25,000 miles per hour—33 times the speed of sound. (Daniel Fleisch and Julia Kregenow, A Student’s Guide to the Mathematics of Astronomy)