Almost all the newly detected gravitational waves were created when black holes collided.(Supplied: Mark Myers/OzGrav)

Gravitational waves were first discovered in 2015 , with the Nobel Prize-winning detection of two merging black holes by the Laser Interferometer Gravitational-wave Observatory (LIGO).

more: abc.net.au/news/science/2021-11-08/record-haul-of-gravitational-waves-detected/100603450