The LHC’s ATLAS detector, illustrated here with two protons colliding, was the first to spot particle collisions November 23, just a week before the collider became the world’s highest-energy particle accelerator.
European Organization for Nuclear Research
The year 2009 saw a lot of big astronomy news stories that didn’t quite make it into the top 10. In late 2009, the Astronomy staff met to discuss which ones to include in the top 10, and which just barely missed the list. Here’s a look at the “next five.”
