SpaceX rocket sticks its landing
![Falcon 9 launch](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/12/spacex_launch.jpg?fit=840%2C449&ssl=1)
WHAT GOES UP The reusable first stage of a Falcon 9 rocket successfully lands after a December 21 test flight, seen in this picture from a helicopter.
SpaceX
WHAT GOES UP The reusable first stage of a Falcon 9 rocket successfully lands after a December 21 test flight, seen in this picture from a helicopter.
SpaceX