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Such black holes are stable and emit no Hawking radiation. Their black hole entropy [2] can be calculated in string theory. It has been suggested by Sean Carroll that the entropy of an extremal black hole is equal to zero. Carroll explains the lack of entropy by creating a separate dimension for the black hole to exist within. [3]
As of February 2022, only one isolated black hole has been confirmed, OGLE-2011-BLG-0462, around 5,200 light-years away. [ 2] The nearest known black hole is Gaia BH1, which was discovered in September 2022 by a team led by Kareem El-Badry. Gaia BH1 is 1,560 light-years away from Earth in the direction of the constellation Ophiuchus.
Celestia is a real-time 3D astronomy software program that was created in 2001 by Chris Laurel. The program allows users to virtually travel through the universe and explore celestial objects that have been catalogued. Celestia also doubles as a planetarium, but the user is not restricted to the Earth's surface, like in other planetarium ...
CXOU J132527.6-430023 (a candidate stellar mass black hole outside of the Local Group) [ 11] Cygnus X-1. Cygnus X-3. GRO J0422+32 (possibly the smallest black hole yet discovered) [ 12] GRO J1655-40 / V1033 Sco (at one time considered the smallest black hole known) [ 13] GRS 1124-683 / GU Mus. GRS 1915+105 / V1487 Aql.
A black hole with the mass of a car would have a diameter of about 10 −24 m and take a nanosecond to evaporate, during which time it would briefly have a luminosity of more than 200 times that of the Sun. Lower-mass black holes are expected to evaporate even faster; for example, a black hole of mass 1 TeV/c 2 would take less than 10 −88 ...
The supermassive black hole at the core of Messier 87, here shown by an image by the Event Horizon Telescope, is among the black holes in this list.. This is an ordered list of the most massive black holes so far discovered (and probable candidates), measured in units of solar masses (M ☉), approximately 2 × 10 30 kilograms.
Cygnus X-1 (abbreviated Cyg X-1) [11] is a galactic X-ray source in the constellation Cygnus and was the first such source widely accepted to be a black hole. [12] [13] It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources detectable from Earth, producing a peak X-ray flux density of 2.3 × 10 −23 W/(m 2 ⋅Hz) (2.3 × 10 3 jansky).
The Swift spacecraft, used by astronomers to determine the mass of the black hole of S5 0014+81. The host galaxy of S5 0014+81 is an FSRQ (Flat Spectrum Radio Quasar) blazar, a giant elliptical galaxy that hosts a supermassive black hole at its center. In 2009, a team of astronomers using the Swift spacecraft used the luminosity of S5 0014+81 ...