Best space pictures of 2014

It's been a busy year for space exploration, with some big milestones reached. NASA successfully tested its new Orion spacecraft, which could one day take astronauts to Mars, while the European Space Agency made history when it landed a probe on a comet. Meanwhile astronauts are increasingly posting incredible shots from the International Space Station on social media giving us more insight into space than ever before. We've pulled together some of these stunning images in our lineup of the best space pictures of 2014