Three International Space Station crew members will leave the spacecraft and return to Earth on Friday, September 11. Watch their departure and landing.
The birth throes of high-mass stars have been shrouded in mystery. While penetrating the mystery, astronomers working in Chile discovered a vast cosmic hourglass.
A spacecraft using Comet Hitchhiker orbits and lands on multiple comets and asteroids using a harpoon and tether and the energy of motion of the small bodies themselves.