In less than 100 seconds, Ben Stappers of the University of Manchester in the UK explains how gravitational waves are the astrophysical equivalent of throwing a stone into a pond: they appear as ripples in space–time. He also explains that gravitational waves have been predicted to exist across a range of different wavelengths and that there are various experiments round the world designed to detect them.
Watch more from our 100 Second Science video series.
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