American astronaut Scott Kelly returned to Earth this week after spending a year in space and will speak about the experience in a NASA news conference on Friday afternoon.
Kelly spent a year on the International Space Station, a mission that aimed to to help scientists understand the effects of prolonged zero-gravity exposure on the human body. Kelly’s twin brother, a retired astronaut, participated in parallel studies on Earth.
Kelly and Russian cosmonaut Mikhail Kornienko landed back on Earth in Kazakhstan on Tuesday after a historic 340 days in space.
Read more: Inside the Gigantic Operation to Meet Astronauts Coming Home
TIME chronicled the year-long mission for a documentary series, A Year in Space, which premiered Wednesday on PBS.
More Must-Reads From TIME
- The 100 Most Influential People of 2024
- Coco Gauff Is Playing for Herself Now
- Scenes From Pro-Palestinian Encampments Across U.S. Universities
- 6 Compliments That Land Every Time
- If You're Dating Right Now , You're Brave: Column
- The AI That Could Heal a Divided Internet
- Fallout Is a Brilliant Model for the Future of Video Game Adaptations
- Want Weekly Recs on What to Watch, Read, and More? Sign Up for Worth Your Time
Write to Katie Reilly at Katie.Reilly@time.com