|
The planetary systems of stars other than the Sun and the Solar System are a staple element in much science fiction. Tau Ceti is the second closest star to the Sun (after Alpha Centauri A) having spectral class G, making it a popular story setting or system of origin in science fiction tales. The Sun, itself of spectral class G, provides an obvious model for the possibility that the star might harbor worlds capable of supporting life. But Tau Ceti, weighing in at ~0.78 M☉, is metal-poor and so is thought to be unlikely to host rocky planets (see ''Destination: Void'' by Frank Herbert below); on the other hand, observations have detected more than ten times as much dust around the star than exists in the Solar System, a condition tending to enhance the probability of such bodies. Since the star's luminosity is barely 55% that of the Sun, those planets would need to circle it at the orbital radius of Venus in order to match the insolation received by the Earth. (See ''Time for the Stars'' by Robert Heinlein below.) Tau is the 19th letter of the Greek alphabet. The name Cetus is also Greek (Κῆτος, ''Kētos'') as well as Arabic (ألقيتوس, ''al Ḳaiṭos'') and translates variously as a large fish, a whale, a shark, or a sea monster. In Greek mythology, the cetacean constellation, although not the star itself, represents the monster slain by Perseus in his rescue of the beautiful princess Andromeda. ==General uses of Tau Ceti== Many stars may be referred to in fictional works for their metaphorical or mythological associations, or else as bright points of light in the sky of Earth, but not as locations in space or the centers of planetary systems. The constellation Cetus lies close to the celestial equator and intersects the plane of the ecliptic, which allows it to be seen from most of the Earth's surface. However, because of its unprepossessing appearance in the sky, and its want of a "good" traditional name to supplement its esoteric Bayer designation, Tau Ceti has rarely if ever been used in a general sense, either in traditional mythologies or in the arts and literature that draw sustenance from them. The star's popularity as a subject of science fiction stems not from its general cultural resonance, but from its astronomical data: * proximity, ~11.9 light-years distant * similarity to the Sun, ~0.78 M☉, spectral type G * a short but technical sounding name, in this context a benefit rather than a detriment * capacity to host a family of earth-like planets (proven in 2012) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tau Ceti in fiction」の詳細全文を読む スポンサード リンク
|