An American astronaut and Russian cosmonaut launched into space    Friday to attempt something their two countries have never done    together before: a one-year mission on the International Space Station    that could help one day send humans to Mars.  
    The epicone-year space missionlaunched    NASA's Scott    Kelly and cosmonaut Mikhail Kornienko into orbit aboard a    Russian Soyuz space capsule at 3:42 p.m. EDT (1942 GMT) today    (March 27) from the Baikonur Cosmodrome in Kazakhstan, where it    was early Saturday morning local time. Also flying on the Soyuz    is cosmonaut Gennady Padalka, a crewmember who    will live and work aboard the orbiting outpost for about six    months, the usual length of time people spend on the    station.  
    "A year in space starts now," NASA spokesperson Dan Huot said    at launch.You can check out avideo of the history-making launchas    well. [The One-Year Space Mission: Full Coverage]  
    It should take Padalka, Kelly and Kornienko about 6 hours to    reach the space station. If all goes according to plan, the    three crewmembers will link up with the space laboratory at    around 9:36 p.m. EDT (0136 March 28 GMT), and you    canwatch the docking live on    Space.comvia NASA TV starting at 8:45 p.m. EDT (0045    March 28 GMT). The hatches between the two spacecraft are    scheduled to open at 11:15 p.m. EDT (0315 March 28 GMT),    allowing the three space fliers to enter the station. The hatch    opening will also air live on Space.com at that time.  
    Scientists will usehealth and other datacollected from    Kelly and Kornienko during their yearlong mission to learn more    about how long-duration spaceflight affects the human body.    While researchers know a lot about what happens to people who    live in space for six months, they don't know how the body    changes with a longer stay in microgravity.  
    Acrewed Mars mission a huge goal for NASA in    the future  could take 500 days or more, according to the    space agency. Therefore, learning more about the potential    problems astronauts could experience during a long mission is    important for NASA officials.  
    Kelly's identical twin brother (and former NASA astronaut)    Mark    Kelly will participate in experiments on the ground to help    scientists monitoring his brother in space. The Kelly twins    will be monitored before, during and after Scott's spaceflight    for a number of experiments chosen by NASA officials.  
    "Today, we launch an American astronaut and a Russian cosmonaut    to live and work in space for an entire year  the longest    continuous stretch an American astronaut will have been in    space," NASA administrator Charles Bolden wrote in    aSpace.com-exclusive op-ed. "It's an    important stepping-stone on our journey to Mars, and will give    us detailed medical data recorded throughout the one-year    expedition."  
    Kornienko and Kelly have been training for this yearlong    mission for about two years, but this won't be the first time    the astronauts have flown to space.  
    Before this mission, Kelly logged 180 days in orbit during two    space shuttle flights and one previous space station mission.    By the end of this mission (scheduled to last about 342 days,    just shy of a year), Kelly will have logged 522 days in space,    according to NASA.  
Read more: 
US, Russian astronauts begin one-year space mission