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The Jovian planet was the first discovered around a red dwarf. [2] [3] First discovered with giant planet(s) Gliese 876: 1998 Gliese 876 b: The giant planet was the first planet discovered around a red dwarf. [2] [3] First discovered with terrestrial planet(s) Kepler-42 : 2012 KOI-961 b KOI-961 c KOI-961 d
Nemesis is a hypothetical red dwarf [1] or brown dwarf, [2] originally postulated in 1984 [3] to be orbiting the Sun at a distance of about 95,000 AU (1.5 light-years), [2] somewhat beyond the Oort cloud, to explain a perceived cycle of mass extinctions in the geological record, which seem to occur more often at intervals of 26 million years.
Dwarf star with no other qualification generally refers to a main-sequence star, a star of luminosity class V: main-sequence stars (dwarfs). Example: Achernar (B6Vep) [2] Red dwarfs are low-mass main-sequence stars. Yellow dwarfs are main-sequence (dwarf) stars with masses comparable to that of the Sun. Orange dwarfs are K-type main-sequence stars.
Red dwarfs [12] are the smallest, coolest, and most common type of star. Estimates of their abundance range from 70% of stars in spiral galaxies to more than 90% of all stars in elliptical galaxies, [13] [14] an often quoted median figure being 72–76% of the stars in the Milky Way (known since the 1990s from radio telescopic observation to be a barred spiral). [15]
In modern usage, the names applied to K-type main sequence stars vary. When explicitly defined, late K dwarfs are typically grouped with early to mid-M-class stars as red dwarfs, [4] but in other cases red dwarf is restricted just to M-class stars. [5] [6] In some cases all K stars are included as red dwarfs, [7] and occasionally even earlier ...
Artist's impression of a blue dwarf. A blue dwarf is a hypothetical class of star that develops from a red dwarf after it has exhausted much of its hydrogen fuel supply. . Because red dwarfs fuse their hydrogen slowly and are fully convective (allowing their entire hydrogen supply to be fused, instead of merely that in the core), they are predicted to have lifespans of trillions of years; the ...
Red Dwarf ' s design from Series X (2012) and onwards. The main setting of the series is the eponymous mining spaceship Red Dwarf. [9] In the first episode, set sometime in the late 21st century, [a] an on-board radiation leak kills everyone except lowest-ranking technician Dave Lister, who is in suspended animation at the time, as punishment for smuggling a cat aboard the ship.
Red dwarf: This red dwarf has a size comparable to that of the planet Saturn. As of 2019, it is the second lightest hydrogen-fusing star known, marginally heavier (0.0777-0.0852M ☉) than the 2MASS J0523-1403. Although its mass is comparable to that of TRAPPIST-1, its radius is 1/3 smaller. [63] [64] [65] Luhman 16 A 60,768 Brown dwarf