For decades, U.S. astronauts and Russian cosmonauts have lived side-by-side aboard the International Space Station. Now some are wondering whether that partnership can withstand the war in Ukraine.

Aerospace engineer Claudia Kessler is searching for Germany's first female astronaut. The country's previous 11 astronauts were all men, which she says highlights German sexism in the sciences.

(Image credit: Soraya Sarhaddi Nelson)

Astronaut Scott Kelly is back from nearly a year in space. NPR's Melissa Block says she misses the photos he shared from orbit, but tweets from his re-entry have been pretty entertaining.

(Image credit: Scott Kelly)

Kelly says his twin brother, Scott Kelly, who just returned to Earth after 340 days in space, was temporarily 2 inches taller. NASA is studying the pair to explore what spaceflight does to the body.

(Image credit: Bill Ingalls/NASA)

During his 340 days aboard the International Space Station, the astronaut documented his time there with hundreds of photos. Kelly says the perspective makes him feel like an environmentalist.

During his 340 days aboard the International Space Station, the astronaut documented his time there with hundreds of photos. Kelly says the perspective makes him feel like an environmentalist.

During astronaut Scott Kelly's year in space, scientists will compare his physiology with that of his twin brother, Mark, to study the effect of prolonged space flight on the human body.