Why can black holes be the most luminous objects in the Universe?
81Black holes may be the most luminous objects in the universe because of quasars—structures formed by supermassive black holes that emit intense light as they consume matter.
The quasar J0529-4351, for example, is 500 trillion times more luminous than the Sun, with an accretion disk seven light-years across.
What is Sagittarius A*?
Sagittarius A* (pronounced "Sagittarius A star") is a black hole with about 4 million times the mass of the Sun.
It is located approximately 26,000 light-years from Earth, in the direction of the constellation Sagittarius.
It is surrounded by a cluster of stars and gas that orbit at extremely high speeds, highlighting its invisible presence.
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