After 168 days in space and orbiting our planet 2,688 times, three crew members are preparing for their journey back to Earth. NASA astronauts Joe Acaba and Mark Vande Hei, along with Russian cosmonaut Alexander Misurkin will depart the International Space Station today. Tune in live at 2:15 p.m. EST to watch as they say farewell and close the hatch to their spacecraft: http://go.nasa.gov/2EZLZ2w
