We long assumed particles carrying the force of gravity couldn’t have mass. That’s wrong – and it may mean gravity travels at different speeds across the cosmos.
Source:
https://www.newscientist.com/article/mg24732902-500-what-does-gravity-weigh-the-surprise-answer-that-reshapes-reality/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home