![]() ![]() The fact that they don't emit any light or other radiation means they could be lurking in our cosmic neighborhood without astronomers being aware of it. The short-lived, high-energy events that produce gamma-ray bursts and gravitational waves may be visible halfway across the observable universe, but for most of their lives black holes, by their very nature, will be almost undetectable. This artist's impression shows the orbits of the objects in the HR 6819 triple system. ![]() As detector sensitivity improves, other wave-generating events besides black hole mergers are being discovered - such as a crash between a black hole and a neutron star, which took place way beyond our own galaxy at a distance of 650 million to 1.5 billion light-years from Earth, Live Science reported. The first discovery, involving the merger of two black holes, was announced back in 2016, and many more have been made since then. With observatories like the Laser Interferometer Gravitational-Wave Observatory and Virgo, we now have the ability to detect these waves, Live Science sister site reported. When they do, the gravitational interaction between them creates ripples in space-time, which propagate outward as gravitational waves - another prediction of Einstein's theory of relativity. Hurt/Caltech-JPL) (opens in new tab)īlack holes don't always exist in isolation - sometimes they occur in pairs, orbiting around each other. Black holes orbiting each other create ripples in space-time, which propagate outward as gravitational waves. Artist's impression of gravitational waves. ![]()
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