2.5 years ago I already wrote about gravitational waves and the role of the LIGO and the Virgo detectors. On the first day that the two LIGO detectors started a gravitational wave from the merger of two black holes was detected. That’s how it got its name btw: GW150914 (Gravitational Wave 14 September 2015).
Both black holes weighed 30 times the mass of the sun. The distance to Earth was a mere 1.3 billion light-years. Enormous amounts of energy were released when they merged. This energy changed the fabric of space and time and caused ripples.
The two LIGO detectors spotted the wave at the same time confirming it was a real discovery. Whole new research lines will appear. Such a triumph for science, the theory of relativity and astronomy.
Here the figure from the paper: