DENNIS OVERBYE writes:
‘After two months of underground and social media rumblings, the first wave of news is being reported Monday about one of the least studied of cosmic phenomena: the merger of dense remnants known as neutron stars, the shrunken cores of stars that have collapsed and burst. …’
First gravitational wave catastrophe that astronomers saw as well as heard, and the most observed astronomical event to date. The video accompanying the article is a lovely explanatory simulation (thanks, Abby).