Video: Marc Buie, New Horizons Occultation Team Lead (members only)

Assuming good weather and a smooth final few weeks on the International Space Station, astronauts Doug Hurley and Bob Behnken are scheduled to undock from the orbiting research outpost Aug. 1 and return to Earth the next day to wrap up a 64-day test flight of SpaceX’s Crew Dragon spaceship.

A $110 million NASA science instrument twice targeted for cancellation by the Trump administration is set for launch Tuesday inside the trunk of a SpaceX Dragon cargo capsule for delivery to the International Space Station, where it will spend three years charting changing carbon dioxide concentrations in Earth’s atmosphere.

The launch of a NASA spacecraft designed to smash into an asteroid to try out a technique that could protect Earth from threatening space rocks has slipped from July until November, at the earliest, after development delays partially caused by coronavirus-related work slowdowns.