Asteroid Redirect Mission
The NASA mission pack is an upcoming official mod pack created by Squad in collaboration with NASA. It is expected to be released after 0.24.
The mission pack will add asteroids, aswell as a bunch of NASA themed parts, such as a robotic grappling device, to the game. It will guide you through a mission where you have to rendezvous with an asteroid, then tow it in an orbit around Kerbin, inorder for you to study it.