Smoke rises as first-stage boosters separate from a Soyuz rocket with a Soyuz MS-10 spacecraft carrying a NASA astronaut and a Russian cosmonaut. The mission was aborted shortly after launch, and the pair returned to Earth safely in an emergency landing. Dmitri Lovetsky/AP hide caption
A 2-millimeter hole was found last week in a Russian Soyuz MS-09 spacecraft (left) that is docked to the International Space Station. NASA/AP hide caption
International Space Station (ISS), computer artwork. Sciepro/Getty Images/Science Photo Library RF hide caption
NASA Administrator Jim Bridenstine is in talks with international companies who might want to take over management of the International Space Station. Jim Watson/AFP/Getty Images hide caption
Sunita Williams conducts routine maintenance during a stint aboard the International Space Station. Nowadays, the astronaut helps Boeing and SpaceX develop private spacecraft. NASA hide caption
Norishige Kanai prior the launch of the Soyuz-FG rocket in Kazakhstan on Dec. 17. As is the norm, the Japanese astronaut grew in outer space, just not by as much as he initially thought. Dmitri Lovetsky/AP hide caption
Russian cosmonaut Anton Shkaplerov, (bottom); Japanese astronaut Norishige Kanai, middle; and U.S. astronaut Scott Tingle, above; wave prior to the launch of the Soyuz-FG rocket at the Russian-leased Baikonur cosmodrome in Kazakhstan on Sunday. Shamil Zhumatov/AP hide caption
The unmanned Antares rocket launched from Wallops Island, Va., on Sunday, carrying with it a Cygnus capsule containing some 7,400 pounds of supplies for astronauts at the International Space Station. Bill Ingalls/NASA/NASA via Getty Images hide caption
In this photo taken by Russian cosmonaut Sergey Ryazanskiy, the SpaceX Dragon capsule arrives at the International Space Station on Wednesday, stocked with scientific equipment, supplies — and ice cream. NASA via AP hide caption
"It's not just about making one German astronaut happy with fresh bread," Marcu explains. "There's really a deeper meaning to bread in space." Above, a photo illustration of bread in space. NASA/ Bake in Space GmbH hide caption
Flight engineer Kate Rubins checks out the Bigelow Expandable Activity Module, which is attached to the International Space Station. NASA hide caption
Astronaut Peggy Whitson became NASA's astronaut with the most time in orbit Monday. She is seen here earlier this year, along with fellow astronauts, in the Quest airlock of the International Space Station. AP hide caption
A Soyuz spacecraft carrying a new crew to the International Space Station, ISS, blasted off Thursday from the Baikonur cosmodrome in Kazakhstan. Dmitri Lovetsky/AP hide caption
NASA astronaut Kate Rubins floats in the International Space Station in September 2016, wearing a spacesuit decorated by patients recovering at the MD Anderson Cancer Center. NASA Johnson/Flickr hide caption
Trent Barton, a volunteer for the study looking at pressure inside the brain during space flights. Courtesy of David Ham hide caption