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magni-. tude. (MV) A B-type main-sequence star (B V) is a main-sequence ( hydrogen -burning) star of spectral type B and luminosity class V. These stars have from 2 to 16 times the mass of the Sun and surface temperatures between 10,000 and 30,000 K. [ 1] B-type stars are extremely luminous and blue. Their spectra have strong neutral helium ...
Updated August 8, 2024 at 1:35 PM. A team of scientists used the James Webb Space Telescope to peer through the veil of dust surrounding a faraway supermassive black hole, revealing that energy ...
An accretion disk is a structure (often a circumstellar disk) formed by diffuse material [ a] in orbital motion around a massive central body. The central body is most frequently a star. Friction, uneven irradiance, magnetohydrodynamic effects, and other forces induce instabilities causing orbiting material in the disk to spiral inward toward ...
The gravitational redshift of a light wave as it moves upwards against a gravitational field (produced by the yellow star below). The effect is greatly exaggerated in this diagram. In physics and general relativity, gravitational redshift (known as Einstein shift in older literature) [ 1][ 2] is the phenomenon that electromagnetic waves or ...
Luminous blue variable AG Carinae as seen by the Hubble Space Telescope. Luminous blue variables ( LBVs) are rare, massive and evolved stars that show unpredictable and sometimes dramatic variations in their spectra and brightness. They are also known as S Doradus variables after S Doradus, one of the brightest stars of the Large Magellanic Cloud .
The matter accreting onto the black hole is unlikely to fall directly in, but will have some angular momentum around the black hole, which will cause the matter to collect into an accretion disc. Quasars may also be ignited or re-ignited when normal galaxies merge and the black hole is infused with a fresh source of matter. [ 48 ]
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]
The term "black hole" was used in print by Life and Science News magazines in 1963, [61] and by science journalist Ann Ewing in her article " 'Black Holes' in Space", dated 18 January 1964, which was a report on a meeting of the American Association for the Advancement of Science held in Cleveland, Ohio. [62] [63]