We are able to detect gravitational waves that have travelled from billions of light years away.

Name: We are able to detect gravitational waves that have travelled from billions of light years away.
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Gravitational waves, predicted by Einstein's theory of general relativity, have been detected from events such as the merging of black holes and neutron stars, some of which occurred billions of light years away. These detections are made by observatories like LIGO and Virgo.

We Are Able to Detect Gravitational Waves That Have Travelled