International Space Station

NASA astronauts (from left) Bob Behnken, Doug Hurley and Chris Cassidy are the U.S. members of the Expedition 63 crew aboard the International Space Station. Behnken and Hurley are scheduled to return to Earth on Aug. 2. NASA hide caption

SpaceX's Crew Dragon capsule approaches the International Space Station ahead of docking Sunday. NASA / NASA TV hide caption

NASA astronaut Doug Hurley rehearses putting on his SpaceX spacesuit last week at the Neil A. Armstrong Operations and Checkout Building at Kennedy Space Center in Florida. Kim Shiflett/NASA hide caption

A SpaceX Falcon 9 rocket carrying more than 4,300 pounds of science and research, crew supplies and vehicle hardware to the International Space Station launches from pad 40 at Cape Canaveral Air Force Station in Florida. This is the final flight of SpaceX's first-generation Dragon cargo capsule. SOPA Images/SOPA Images/LightRocket via Gett hide caption

This photo provided by NASA shows the view from NASA's Andrew Morgan's helmet cam as Italian astronaut Luca Parmitano works outside the International Space Station during a spacewalk Saturday. AP hide caption

Boeing, NASA, and U.S. Army personnel work around the Boeing Starliner spacecraft shortly after it landed in White Sands, N.M., Sunday. Bill Ingalls/AP hide caption

A time exposure of the United Launch Alliance Atlas V rocket carrying the Boeing Starliner crew capsule on an flight test to the International Space Station lifts off in Cape Canaveral, Fla., on Friday. Terry Renna/AP hide caption

Astronauts Christina Koch (right) and Jessica Meir pose for a photo on the International Space Station on Oct. 4. NASA moved up the first all-female spacewalk because of a power system failure at the space station. NASA via AP hide caption

India launched a ballistic missile defense interceptor last week — and NASA says it created dangerous debris in orbit. "We have identified 400 pieces of orbital debris from that one event," NASA Administrator Jim Bridenstine said. Handout/Reuters hide caption

While she was working last week, U.S. astronaut Anne McClain realized that she needed a medium-size suit for spacewalking. Dmitri Lovetsky/AP hide caption

The Crew Dragon landed safely in the Atlantic Ocean on Friday morning, with a splashdown at 8:45 a.m. ET, as scheduled. The uncrewed craft had been on a test flight in which it docked with the International Space Station. NASA TV Screenshot by NPR hide caption

In this photo provided by NASA, the SpaceX Crew Dragon is pictured just beside the International Space Station. SpaceX's new crew capsule arrived at the station on Sunday in a remarkable moment for commercial space exploration. NASA via AP hide caption