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Prime Minister Narendra Modi (center) attends the opening of the 106th Indian Science Congress at Lovely Professional University on last week in Jalandhar, India. Pardeep Pandit/Hindustan Times via Getty Images hide caption

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Pardeep Pandit/Hindustan Times via Getty Images

The plane of the Milky Way Galaxy, which we see edge-on from our perspective on Earth. The projection used in ESO's GigaGalaxy Zoom project gives the impression of looking at the Milky Way from the outside. Serge Brunier/ESO hide caption

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Serge Brunier/ESO

Einstein realized that if masses moved about, the deformations in space would also move about, propagating like waves, somewhat like what happens when you throw a rock on a pond. But, gravity being such a weak force, the effect is truly tiny and needs something very dramatic to create a signal we can detect here. This is exactly what was found by LIGO and the Nobel winners. traveler1116/Getty Images hide caption

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traveler1116/Getty Images