Live coverage: Dragon supply ship returns to Earth

NASA simulated an in-flight launch abort of an Orion crew capsule high above Cape Canaveral on Tuesday, in a major test of the safety system that would whisk astronauts on future moon missions away from a failing rocket.

SpaceX’s plan to send a Dragon capsule to Mars in 2018 will be the first in a sequence of unmanned commercial missions to the rust-colored world before the first voyage with humans as soon as 2024, SpaceX founder Elon Musk said Wednesday.

Bidding their crewmates farewell, a Russian cosmonaut and two NASA astronauts boarded their Soyuz ferry craft, undocked from the International Space Station and fell back to Earth Tuesday, landing safely on the snowy steppe of Kazakhstan to close out a 168-day mission.