Astronaut Scott Kelly's Big First Day Back on Earth

PHOTO: International Space Station (ISS) crew member Scott Kelly of the U.S. rests in a chair after landing by the Soyuz TMA-18M space capsule near the town of Dzhezkazgan, Kazakhstan, on March 2, 2016. PlayKrill Kudryavtsev/Pool Photo via AP
WATCH Astronaut Scott Kelly's First Day Back on Earth

After making the journey from space back to Earth, astronaut Scott Kelly is spending his first full day on the planet flying halfway around the world heading to Houston, where he'll be reunited with his family.

Interested in ?

Add as an interest to stay up to date on the latest news, video, and analysis from ABC News.
Add Interest

Waiting for Kelly, 52, in Houston will be his two daughters and girlfriend, along with his identical twin brother, retired astronaut Mark Kelly, and his sister-in-law, former Arizona Rep. Gabrielle Giffords. Jill Biden will also be on hand to welcome Kelly home after his historic year in space.

Kelly is set to arrive in Houston around 11:45 p.m. ET but still has more work to do before he can begin adjusting to life at home. During his final news conference from space last week, Kelly said NASA will put him through a battery of tests as soon as he returns to measure any changes in his health.

The tests conducted include a vision check, since a micro-gravity environment can put pressure on an astronaut's optic nerves. NASA will also look at Kelly's physical health, including his bone density, muscles and cardiovascular system. He'll also be asked to complete tasks testing his motor skills and assessing his psychological state.

The one-year mission was designed to help NASA better understand what happens to an astronaut's physical and mental health during a prolonged stay in a micro-gravity environment. Kelly's results will be compared with those of his identical twin brother, Mark Kelly, who served as the control subject on Earth.

After Kelly's initial testing is complete, he told reporters last week the one thing he wanted to do most back on Earth.

"I'm going to go home and jump in my pool," he said.