Live coverage: Three Chinese astronauts return to Earth

A three-minute test flight Tuesday morning over Cape Canaveral will help ensure NASA’s Orion crew capsule — the vehicle being built to carry astronauts back to the moon — can safely escape from a catastrophic failure on launch.

Four more satellites for SES Networks’ O3b broadband fleet launched Thursday aboard a Soyuz rocket. Liftoff of the Soyuz launcher from the Guiana Space Center in South America occurred at 1703 GMT (1:03 p.m. EDT).

In a rapid-fire crew exchange, three space station fliers return to Earth Friday morning, landing on the steppe of Kazakhstan just four days before their replacements blast off from the Baikonur Cosmodrome a few hundred miles away, boosting the lab’s crew back to six.