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Twin astronauts Scott and Mark Kelly were separated for almost a year, undergoing intensive measurements when one was in space and one was on Earth. But that was only the beginning of their scientific odyssey.

"Beyond A Year in Space," PBS and Time's follow-up documentary to last year's — which followed Scott Kelly from launch to landing — chronicles Kelly's return to life on Earth and the extensive medical testing the duo undergo to determine exactly what changes have occurred as a result of his record-breaking stay on the International Space Station. The documentary also follows two new astronauts, Jessica Meir and Victor Glover, training to go even further.

"Beyond A Year in Space" will premiere Wednesday, Nov. 15 from 9 to 10 p.m. EST on PBS, following an encore presentation from 8 to 9 p.m. of its precursor "A Year in Space." The latter originally aired in 12 parts online over the course of Kelly's mission. [Astronaut Scott Kelly's 12 Best Photos from His Year in Space]

"Two men with identical genomes, identical careers," Jeff Kluger, science editor for Time, said in an exclusive clip from the documentary provided to Space.com. "You send one man to space for one year … you track the other man living an earthly life for that same one year, subtract the differences — that's what space did."

"Beyond A Year in Space" follows astronauts Scott and Mark Kelly after Scott's return home from nearly a year on the International Space Station, as well as some of the new astronauts preparing to go to Mars and beyond.
"Beyond A Year in Space" follows astronauts Scott and Mark Kelly after Scott's return home from nearly a year on the International Space Station, as well as some of the new astronauts preparing to go to Mars and beyond.
Credit: PBS and Time

The clip focuses on the many tests the Kelly brothers undergo now that they're both on solid ground, in the hopes of clarifying the changes caused by space. Preliminary data from the Twins Study has already revealed thousands of genes changing their activation, an effect that lingers temporarily when an astronaut returns to Earth. Final results of the twins' genetic changes — and larger-scale changes to muscles, bone density and eyesight, for instance — are expected next year, agency officials have said. Researchers are not only comparing the two astronauts, but also how much each one changed over the course of the year. The brothers provided about a year's worth of samples before the mission, plus Scott's 1,076 samples from space and the many follow-up measurements and samples from the ground. 

"As a geneticist, I wish everyone had a twin on Earth or in space, but in this case, we were just lucky," Christopher Mason, a researcher at Weill Cornell Medical College in New York, said in the video clip.

  • Space.com
  • Retire and hang up your spacesuit and astronaut wings.
  • Order up a pizza and nice, cool drink.
  • Take a hot shower.
  • Sleep on a bed with a pillow again at last.
  • Write a book. Maybe a movie!
  • I'm going to Disneyland!

The clip walks the viewer through a sampling of the comprehensive tests the brothers are going through, which might be inconvenient, but (beyond some good-natured complaining), they don't seem to mind.

After all, "They have more genetic information on my brother and I than they do on any other people," Scott Kelly said in the clip. "Ever." 

You can learn more about Scott Kelly's year in space at the Beyond a Year in Space website

Email Sarah Lewin at slewin@space.com or follow her @SarahExplains. Follow us @Spacedotcom, Facebook and Google+. Original article on Space.com