Supernovae and the big bang’s afterglow give us conflicting numbers on how fast the universe is expanding. Gravitational waves could help settle things
Source:
https://www.newscientist.com/article/2214225-gravitational-waves-could-settle-mystery-of-the-universes-expansion/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home