On March 27 , 2015 , NASA cosmonaut Scott Kelly and Russian cosmonaut Mikhail Kornienko found to the International Space Station ( ISS ) . Now , almost one year on , they ’re preparing to return to Earth from their groundbreaking mission .

Kelly and Kornienko , together with Russian astronaut Sergey Volkov who has been on the post for 6 months , will undock from the ISS at 8.05 p.m. EST on Tuesday , March 1 ( 1.05 a.m. GMT on Wednesday ,   March 2 ) . Almost three hours later , at 11.27 p.m. EST ( 4.27 a.m. GMT ) , they will touch down in Kazakhstan , 342 day since they left Earth .

It ’s set to be a pretty momentous twenty-four hours , and there areplenty of waysto get call for . NASA television will begin coverage of the entire undocking and landing tomorrow from 3.10 p.m. EST ( 8.10 p.m. GMT ) , when you   can determine Kelly hand over command of the place to fellow NASA astronaut Tim Kopra . We ’ve embedded the live flow   below for you to tune up in .

Coverage of Scott Kelly ’s departure will get on Tuesday March 1 at 3.10 p.m. EST ( 8.10 p.m. GMT )

On Twitter , you could follow along with # YearInSpace and posture head to # askNASA . And on Friday , there will be both a press group discussion on NASA TV , and a Q&A onRedditwith scientists and medical doctors from NASA ’s Johnson Space Center .

Kelly and Kornienko are the first astronauts to drop this long on the ISS in a single mission , with previous charge lasting only 6 months . One goal of the missionary station is to see if humans can cope with prolonged space travel , something that will be a requisite for return trip-up to Mars , which could last up to 3 year . In a late wardrobe conference , Kelly said he was feeling dandy aboard the ISS , joking : “ I could go another class if I had to . ”

During the mission Kelly ’s twin crony Mark Kelly , a former spaceman , remained on the ground . Scientists have been quiz both Scott and Mark and will contemplate how space travel has affect one brother compared to the other on Earth .

This deputation will only order Kelly and Kornienko fourthly on the all - time lean of the 10   longest human spaceflights , though . The top three   were all fix aboard the Mir space station , with the recollective being Russian Valeri Polyakov ’s halt from January 1994 to March 1995 , which lasted 437 days .

But it ’s still a hugely significant mission , and it brings us ever closer to one solar day seeing mankind set foot on the open of Mars .