Gravitational waves could help us find out how fast the universe's expansion is accelerating
Gravitational waves from merging black holes distorted due to a phenomenon predicted by Einstein could be a new way of measuring the rate of cosmic expansion.
![Gravitational waves could help us find out how fast the universe's expansion is accelerating](http://cdn.mos.cms.futurecdn.net/oMmsKJbW4asVfggiG3me4J.jpeg?#)