Live coverage: Rosetta’s final hours

The European Space Agency revealed plans Thursday to build and launch a joint space weather research satellite with China and announced three finalists for Europe’s next standalone science mission.

An all-veteran crew of four astronauts jetted into NASA’s Kennedy Space Center Friday for the final few days of rehearsals, briefings, and relaxation before blasting off Thursday bound for a six-month stint on the International Space Station.

Debuting a two-tier structure designed to accommodate dozens of small satellites on a single mission, an Italian-made Vega rocket is set for liftoff Saturday night from the northeastern coast of South America on a flight to demonstrate European industry’s answer to growing rideshare launch demand.