Year in Review Astronomy This year’s neutron star collision unlocks cosmic mysteries Discovery offers clues to heavy element formation, universe’s expansion and more CRASH AND WAVE In a galaxy 130 million light-years away, two neutron stars collided. This year, in the first detection of its kind, observatories caught the resulting gravitational waves and light show (illustrated). NSF, LIGO, Sonoma State Univ., A. Simonnet Share this:EmailFacebookTwitterPinterestPocketRedditPrint By Emily Conover December 13, 2017 at 9:31 am Thousands of astronomers and physicists. Hundreds of hours of telescope observations.