At any given time there are somewhere in the neighborhood of 22,000 pieces of debris 10 centimeters or larger zipping along in orbit at speeds of seven kilometers per second, according to the U.S. Air Force. But Sigrid Close, an assistant professor of aeronautics and astronautics at Stanford University, says billions of very tiny meteoroids do more damage to satellites and other spacecraft than all the space junk orbiting Earth. [Read more...]