Un "horizonte par" no es una cosa, pero un "horizonte de sucesos" sí lo es.

LIGO detected the ripples in spacetime on September 14, 2015, from two black holes that had collided over a billion years ago.

The X-ray source was discovered in 1964, and its behavior convinced many astronomers it was a black hole.

In 1974 Hawking showed that black holes should emit faint radiation and eventually evaporate, though the effect has never been observed directly.

The supermassive black hole at our galaxy's center was imaged for the first time in 2022.