Thanks to signals from the merging of two pairs of black holes, scientists at various gravitational wave detectors have determined that these celestial bodies, from which not even light can escape, can rotate in unprecedented ways. The collaboration between the LIGO, Virgo, and KAGRA observatories recently presented these new results in the journal The Astrophysical Journal Letters. "These results demonstrate the extraordinary capabilities of gravitational wave observatories," explains Gianluca Gemme, spokesman for the Virgo collaboration.

By analyzing gravitational waves from the merger of two black holes located 1.3 billion light-years away, scientists from the international LIGO collaboration (from the English laser interferometer gravitational-wave observatory) have been able to prove a theory developed by Stephen Hawking more than forty years ago. The British physicist, who died in 2018, hypothesized that the black hole resulting from the merger of two matter-guzzling black holes would necessarily be larger than the sum of the sizes of the two originals.

A black hole with a mass 225 times that of our Sun. This is the result of the powerful merger of several black holes detected by scientists from the United States, Italy, and Japan through the international LIGO-VIRGO-KAGRA (LIGO-VIRGO-KAGRA) consortium. This is the most massive merger of black holes ever observed, and they were able to detect it through gravitational waves, which are tiny distortions in space-time in the form of ripples caused by violent cosmic events like this one. They have named the signal they detected from the observatories GW231123 and will present it at the 24th International Conference on General Relativity and Gravitation (GR24) and the 16th Edoardo Amaldi Conference on Gravitational Waves, which are being held in the United Kingdom until Friday.

Up to 300 intermediate-mass black holes and 2,500 active black holes in dwarf galaxies. This is the double discovery of an international team of scientists through the Dark Energy Spectroscopic Instrument (DESI), which could expand human understanding of the Universe and pave the way for future research into galaxy formation.

It's called M87* and it became famous on April 10, 2019, when a photo of it went around the world. It is a black hole that is 40 billion kilometres in diameter and has a mass equivalent to 6.5 billion suns and is at the center of a galaxy located 55 million light years from Earth. After presenting it in society two years ago with the first image captured of one of these cosmic monsters, the scientific team of the Event Horizon Telescope (EHT) has just published a new image that contains more information and that has allowed exploration of its inside.