Four astronauts headed to the International Space Station on Sunday, where they will oversee the arrival of two new rocketships during their half-year stint.SpaceX's Falcon rocket blasted off from Kennedy Space Center, carrying Nasa's Matthew Dominick, Michael Barratt, Jeanette Epps, and Russia's Alexander Grebenkin.The astronauts should reach the orbiting lab on Tuesday.

Four astronauts headed to the International Space Station on Sunday, where they will oversee the arrival of two new rocketships during their half-year stint.SpaceX's Falcon rocket blasted off from Kennedy Space Center, carrying Nasa's Matthew Dominick, Michael Barratt, Jeanette Epps, and Russia's Alexander Grebenkin.The astronauts should reach the orbiting lab on Tuesday.