Astronomical milestones of 2015
Pluto stole the spotlight, but plenty of other stuff happened in space this year
![MESSENGER](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/12/122615_box1.jpg?fit=860%2C460&ssl=1)
FORGET PLUTO The Mercury orbiter MESSENGER (shown) crash-landed into the planet in one of several monumental moments for space missions this year.
NASA, JHUAPL, Carnegie Institution of Science