SpaceX’s Crew Dragon capsule departed the International Space Station early Friday morning and began a series of thruster burns that steered the ship back toward Earth, where it safely splashed down in the Atlantic Ocean not long after 7:30 a.m. EST. The craft had been attached to the space station since Sunday, when it made its first docking under its own power after a successful Saturday launch atop a Falcon 9 rocket.

This final phase of the Demo-1 mission was perhaps the biggest test o