Live coverage: Rosetta’s final hours

A sequence of images captured by NASA’s Cassini spacecraft last month are the most detailed pictures ever taken of Saturn’s famous rings, revealing complex, unexplained bands and the movements of dozens of tiny icy moonlets spinning around the planet.

Bill Shepherd, a former Navy SEAL-turned astronaut who arrived at the International Space Station 20 years ago Monday to begin the continuous occupancy of the orbiting research outpost, says the experience gained by NASA and its global partners over the last two decades provides a blueprint for missions to the moon, Mars, and beyond.

The launch for the second Falcon Heavy rocket from the Kennedy Space Center in Florida has slipped until Wednesday at the earliest. The powerful rocket is due to carry the Arabsat 6A communications satellite into orbit.