5 facts
Sagittarius A* (pronounced 'A star') is a compact radio source located at the very center of the Milky Way galaxy, approximately 26,000 light-years from Earth. Its immense gravitational pull influences the orbits of nearby stars, confirming its status as a colossal supermassive black hole.
The Perseus galaxy cluster contains a supermassive black hole that generates pressure waves, creating a B-flat note 57 octaves below middle C. This sound is far too low for the human ear to perceive.
The event horizon is the boundary around a black hole beyond which nothing, not even light, can escape. It marks the point of no return, a critical concept in general relativity.
Rather than empty spaces, black holes are regions in spacetime where gravity is so intense that nothing, not even light, can escape. They form from the remnants of massive stars that collapse under their own gravity, creating a singularity.
Known as Gaia BH1, it's located in the constellation Ophiuchus and is about 10 times the mass of our Sun. This discovery challenges previous assumptions about how many dormant black holes exist in our galaxy and their detectability.