Gravitational waves
Gravitational waves are ripples in space-time that occur when two massive objects collide in space. Albert Einstein was the first to predict gravitational waves in his General Theory of Relativity, but it was only 100 years later in 2015 that they were finally discovered by the sensitive instruments on the LIGO interferometer. ESA's LISA mission will continue the search using even more sensitive instruments from Earth's orbit, with the potential to massively increase our ability to detect these faint ripples in the fabric of space-time.
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