Now, a 13-year survey of light from pulsars scattered across the galaxy may have revealed the first hints of these background signals. Gravitational waves are distortions in the very fabric of ...

Gravitational waves emitted when distant black holes collide and merge, causing the very fabric ... the "fossil light" from just after the Big Bang called the cosmic microwave background.

All of these emit gravitational waves as they ... black hole stress the brown dwarf. So multi-messenger observations of light and gravity could further distinguish background signals.