The ripples created in gravitational waves by stars or planets could let us examine things cosmic objects that we can't see, including dark matter
, ripples in space-time caused by the motion of massive objects. As they flow across things like stars and planets, parts of these waves should slow down and travel just behind the original ripple in a kind of echo that could let us examine celestial objects we can’t see – maybe even dark matter.
Only the most massive objects in the universe create measurable gravitational waves. Most of the ones that have been detected so far have come from
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