While the source of space launches has diversified, Russia remains one of the two space superpowers.
China’s 2007 test of an anti-satellite missile added nearly 3,000 fragments to the number of deadly or destructive items orbiting earth.
Much of the French debris can be traced to an accident in 1996, when a military satellite collided with a spent French rocket.
Why is the U.S. space program shying away from its ambitious missions of the past?
Fifty years after Sputnik, is there any reason for the United States to redouble its commitment to space exploration?