Neutron stars2-crop

Swope and Magellan telescope optical and near-infrared images of the first optical counterpart to a gravitational wave source, SSS17a, in its galaxy, NGC 4993. The left image is from Aug. 17, 11 hours after the LIGO/Virgo detection of the gravitational wave source, and contains the first optical photons of a gravitational wave source. The right image is from four days later. SSS17a, which is the aftermath of a neutron star merger, is marked with a red arrow. On the first night, SSS17a was relatively bright and blue. In only a few days, it faded significantly and its color became much redder. These observations show that heavy elements like gold and platinum were created in the merger. Photos courtesy 1M2H/UC Santa Cruz and Carnegie Observatories/Ryan Foley