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First black hole to have an accurate parallax measurement of its distance from our solar system B K [4] 0.7: Early K giant star 8100 ± 1000: 2.49 ± 0.30: GRO J0422+32: Binary star system with orbit t=5.09 h 04 h 21 m 42.723 s +32° 54′ 26.94″ 1992 Aug 5 A BH: 3.97 ± 0.95: B M1: 0.5 ± 0.1: 8150: 2.5: MACHO-96-BLG-5: Candidate isolated ...
OJ 287 core black holes — a BL Lac object with a candidate binary supermassive black hole core system [23] PG 1302-102 – the first binary-cored quasar — a pair of supermassive black holes at the core of this quasar [24] [25] SDSS J120136.02+300305.5 core black holes — a pair of supermassive black holes at the centre of this galaxy [26]
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 supergiant elliptical galaxy NGC 4889, at a distance of 336 million light-years away in the Coma Berenices constellation, contains a black hole measured to be 2.1 +3.5 −1.3 × 10 10 (21 billion) M ☉. [107] Masses of black holes in quasars can be estimated via indirect methods that are subject to substantial uncertainty.
Estimated radius of the event horizon of the supermassive black hole in NGC 4889, the largest-known black hole to date 10 14: 100 Tm: 180 Tm Size of the debris disk around the star 51 Pegasi [41] 10 15: 1 petameter (Pm) ~7.5 Pm Supposed outer boundary of the Oort cloud (~ 50,000 au) 9.461 Pm
The Cosmic Background Explorer (COBE / ˈ k oʊ b i / KOH-bee), also referred to as Explorer 66, was a NASA satellite dedicated to cosmology, which operated from 1989 to 1993.Its goals were to investigate the cosmic microwave background radiation (CMB or CMBR) of the universe and provide measurements that would help shape the understanding of the cosmos.
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