The world around us
20152015: Gravitational waves
Astronomy gained a new channel of information about the Universe.
LIGO detected a signal from two merging black holes on 14 September 2015. The discovery was announced after verification in 2016.
The measured distance changes were exceptionally small. Matching signals at two observatories and analysing disturbances helped distinguish the event from noise.
Sources
AI-generated photorealistic collage illustrating the theme of the year.