NASA has unveiled more details about its upcoming series of missions to return humans to the Moon as early as 2018. The new crew vehicle will look very similar to the old Apollo module but it will be three times larger, allowing four astronauts to travel to the Moon at a time. Each ship can be reused 10 times, and NASA hopes to get as many as 2 launches a year, with astronauts spending 4-7 days on the surface. Eventually, once a lunar outpost is built at the southern pole, astronauts will be able to live on the Moon for 6 months at a time.