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A quasi-star (also called black hole star) is a hypothetical type of extremely massive and luminous star that may have existed early in the history of the Universe. They are thought to have lived around 7-10 million years due to their immense mass .
A black hole is an extremely dense astronomical object from which nothing can escape, not even light. When a star explodes in a supernova, a black hole can be left behind. Alternatively, a supermassive star can burn through its fuel quickly and turn into a black hole, no explosion needed.
Sagittarius A*, abbreviated as Sgr A* (/ ˈ s æ dʒ ˈ eɪ s t ɑːr / SADGE-AY-star [3]), is the supermassive black hole [4] [5] [6] at the Galactic Center of the Milky Way.
A black hole is a region of universe where gravity is so outrageously strong that nothing, not even light, can escape. Once something enters a black hole by crossing an invisible boundary...
A black hole is an astronomical object with a gravitational pull so strong that nothing, not even light, can escape it. A black hole’s “surface,” called its event horizon, defines the boundary where the velocity needed to escape exceeds the speed of light, which is the speed limit of the cosmos.
In a magnificent first, we finally have direct observational evidence of the stellar process that produces neutron stars and black holes. From a supernova that exploded in a nearby galaxy, astronomers observed the emergence of something with the hallmarks of such compact objects.
Black hole, cosmic body of extremely intense gravity from which nothing, not even light, can escape. It can be formed by the death of a massive star wherein its core gravitationally collapses inward upon itself, compressing to a point of zero volume and infinite density called the singularity.
Intermediate-mass black hole found in ω Centauri. Fast-moving stars have been discovered in the middle of the nearby star cluster ω Centauri using two decades of Hubble Space Telescope...
Stellar mass black holes are formed from the terminal collapse of massive stars if the ensuing neutrino shock is unable to eject the stellar envelope. Direct observations of black hole formation remain inconclusive. We report observations of M31-2014-DS1, a massive, hydrogen-depleted supergiant in the Andromeda galaxy identified via a mid-infrared brightening in 2014. Its total luminosity ...
Stars hint at an unusual black hole lurking in our Galaxy. Images taken by the Hubble Space Telescope point to an elusive intermediate-size black hole in the star cluster ω Centauri.