nebula

• n. 星雲; 角膜混濁

ラテン語のnebula、雲、霧、蒸気、PIE* nebh、雲、語源Neptuneから。

nebula

nebula: [17] As its form suggests, nebula was originally a Latin word, but it goes back to a prehistoric Indo-European base (*nebh- ‘cloud’) which produced a wide range of other descendants, including German nebel ‘cloud’, Greek néphos ‘cloud’, and Latvian debess ‘sky’. It also got into Old English, as nifol ‘dark’. The Latin word was originally used in English for a sort of ‘cataract’ over the eye, and the presentday astronomical application to a ‘cloud’ of stars did not emerge until the early 18th century. The derivative nebulous [16] is an earlier borrowing.

nebula (n.)

early 15c., nebule "a cloud, mist," from Latin nebula "mist, vapor, fog, smoke, exhalation," figuratively "darkness, obscurity," from PIE *nebh- "cloud" (cognates: Sanskrit nabhas- "vapor, cloud, mists, fog, sky;" Greek nephele, nephos "cloud;" German Nebel "fog;" Old English nifol "dark, gloomy;" Welsh niwl "cloud, fog;" Slavic nebo).

Re-borrowed from Latin 1660s in sense of "cataracts in the eye;" astronomical meaning "cloud-like patch in the night sky" first recorded c. 1730. As early as Hershel (1802) astronomers realized that some nebulae were star clusters, but certain distinction of relatively nearby cosmic gas clouds from distant galaxies was not made until 1920s, using the new 100-inch Mt. Wilson telescope.

1. The size of the nebula at this stage is inversely proportional to its mass.

この段階の星雲の大きさは、その質量に反比例しています。

2.The Trifid Nebula itself represents the final phase of star formation.

三つ葉星雲自体が恒星形成の最終段階を表している。

3.A powerfl telescope can resolve a nebula into stars.

星雲から星を見分ける高性能望遠鏡。

4.We have identified the Crab Nebula as the debris of this explosion.

カニ状星雲が今回の爆発の遺跡であることを証明した。

5.A nebula is really a discrete mass of innumerous stars.

一団の星雲は、実際には無数の星の不連続な集合体である。