Snapshots from Atlas 5 launch

A three-man crew that departed the International Space Station on Oct. 4 flew their Soyuz spaceship into position to take spectacular photos of the orbiting research complex as officials prepare to celebrate the 20th anniversary of the first element’s launch.

Critical tests are on tap this weekend to confirm Boeing’s Starliner capsule can safety carry its two-person crew back to Earth despite unexpected helium leaks and degraded maneuvering thrusters, officials said Thursday.

A critical test-firing of the Space Launch System’s core stage engines cut off about a minute into a planned eight-minute burn Saturday on a test stand at NASA’s Stennis Space Center in Mississippi. The rocket’s four engines ignited at 5:27 p.m. EST (2227 GMT) for a test that was to pave the way for the core stage’s shipment to the Kennedy Space Center for launch preparations.