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Location: Constellation Ara. Key facts: A black hole with a mass of about 5-10 solar masses, surrounded by an accretion disk visible in X-rays.

Location: In the galaxy Messier 87. Key facts: First black hole to be imaged directly, has a mass of about 6.5 billion solar masses.

Location: Throughout the Universe. Key facts: Formed by the gravitational collapse of a star after a supernova, masses typically range from about 5 to 20 solar masses.

Location: Centers of galaxies. Key facts: Can have masses ranging from millions to billions of solar masses, thought to play a role in galaxy formation and evolution.

Location: Constellation Scorpius. Key facts: It was the first black hole to have its spin measured; it is approximately 5,300 light-years from Earth.

Location: The center of the Milky Way galaxy. Key facts: Supermassive black hole, roughly 4 million times the mass of the Sun.

Location: Extremely large galaxies. Key facts: These are the largest type of black holes, with masses exceeding 10 billion solar masses.

Location: Constellation Cygnus. Key facts: Known for its volatile outbursts, it's roughly 9,000 light-years from Earth.

Location: Potential locations in galactic centers or globular clusters. Key facts: Their masses range between 100 and one million solar masses.