出典:Wiktionary
Calque of German Dunkle Materie, from dunkel (“dark”) and Materie (“matter”). Coined by Swiss astronomer Fritz Zwicky in German in 1933, to account for the apparent mass needed to account for galaxy clusters, where the mass of luminous matter did not add up to enough of a gravitational effect, inferring nonluminous matter must exist to account for the missing mass. The term gained new popularity due to the missing mass found in galaxies to account for galaxy rotation curves discovered by Vera Rubin in research published in English in the 1970s.
出典:Wikipedia
出典:『Wikipedia』 (2011/08/06 00:57 UTC 版)
In astronomy and cosmology, dark matter is matter that is inferred to exist from gravitational effects on visible matter and gravitational lensing of background radiation, but that neither emits nor scatters light or other electromagnetic radiation (and so cannot be directly detected via optical or radio astronomy). Its existence was hypothesized to account for discrepancies between calculations of the mass of galaxies, clusters of galaxies and the entire universe made through dynamical and general relativistic means, and calculations based on the mass of the visible "luminous" matter these objects contain: stars and the gas and dust of the interstellar and intergalactic medium.
真っ暗なこと
暗いかげ
深いやみ.
暗いさま
ほの暗いこと
うしろ暗いこと
the condition of suspiciousness and underhandedness