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A quasi-star (also called black hole star) is a hypothetical type of extremely large and luminous star that may have existed early in the history of the Universe. They are thought to have existed for around 7–10 million years due to their immense mass .
Black holes of stellar mass form when massive stars collapse at the end of their life cycle. After a black hole has formed, it can grow by absorbing mass from its surroundings. Supermassive black holes of millions of solar masses (M ☉) may form by absorbing other stars and merging with other black holes, or via direct collapse of gas clouds.
A stellar black hole (or stellar-mass black hole) is a black hole formed by the gravitational collapse of a star. [1] They have masses ranging from about 5 to several tens of solar masses . [ 2 ] They are the remnants of supernova explosions, which may be observed as a type of gamma ray burst .
White hole: The polar opposite of a black hole, it ejects matter from its core into space. It is hypothetically formed when a region around a black hole experiences a loss in entropy, and will immediately collapse when the entropy is restored.
General relativity predicts that any object collapsing beyond a certain point (for stars this is the Schwarzschild radius) would form a black hole, inside which a singularity (covered by an event horizon) would be formed. [2] The Penrose–Hawking singularity theorems define a singularity to have geodesics that cannot be extended in a smooth ...
The black hole, in a galaxy some 4 billion light-years from Earth, likely has a mass at least 100 million times that of Earth's Sun. Astronomers reached this theory using data from the Hubble and ...
It is the first star pair ever found near a supermassive black hole. Binary stars often appear as a single object in the night sky to the naked eye, but can often be detected with telescopes and ...
Direct collapse black hole: a black hole formed from the collapse of hydrogen, rather than from a star; Primordial black hole, a black hole that might have formed in a similar fashion to a star during the Universe's earliest epochs; Extremal black hole, the smallest possible black hole that could exist while rotating at a specific speed; White ...