Now that the ESA has landed on a comet, NASA wants to do them one better: capture an entire asteroid (or a piece of one) and put it in orbit around the moon in 2019. But the space agency has now said that it's delaying a decision on exactly how the Asteroid Redirect Mission will do that until 2015. Option A involves bagging and capturing an entire meteorite about 30 feet across, while option B would see them landing on larger target, Philae-style, and digging out a boulder-sized chunk (see the video below). In both cases, it will be towed back to the moon and placed in orbit there. Astronauts launching from the upcoming Space Launch System (SLS) in an Orion capsule will then intercept the orbiting meteorite in 2020, retrieve samples and return to Earth.