Black Holes and Universe Expansion
Most recent answer: 03/02/2016
- Chris Heald (age 42)
Salem, OR, USA
Black holes orbiting each other do send out ripples in spacetime, as the recent LIGO results showed. That barely detectable effect plays essentially no role in the expansion of the universe. Most of that expansion is just left from the early Big Bang event. We aren't sure what's driving the current increase in the expansion rate. We usually call the source of that increase Dark Energy, but we know almost nothing about it except that it hasn't changed much in the last few billion years.
(published on 03/02/2016)