The first gravitational wave detected by LIGO was produced by the merger of two black holes approximately 1.3 billion years ago.
Sources
- The biggest scientific breakthroughs of the last 25 years—and ... (nationalgeographic.com)
- https://www.ligo.caltech.edu/news/ligo20160211 (ligo.caltech.edu)
- https://www.ligo.caltech.edu/page/press-release-gw150914 (ligo.caltech.edu)
- https://news.mit.edu/2016/ligo-first-detection-gravitational-waves-0211 (news.mit.edu)
- https://ligo.org/detections/GW150914/ (ligo.org)
- https://www.scientificamerican.com/article/gravitational-waves-discovered-from-colliding-black-holes1/ (scientificamerican.com)
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