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EMISSION NEBULA [1 record]

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Record 1 1977-08-29

English

Subject field(s)
  • Astrochemistry and Cosmochemistry
  • Astronomy
OBS

A spectrogram of the Orion nebula discloses a bright-line spectrum, indicating that the gas in this nebula is at a low pressure and emits its own light. Such a nebula is therefore called an "emission nebula".

French

Domaine(s)
  • Astrochimie et cosmochimie
  • Astronomie
OBS

[...] «certaines» nébuleuses diffuses montrent un spectre de raies brillantes absolument caractéristique [...] D'autres nébuleuses irrégulières donnent au contraire un spectre continu, sillonné de raies sombres, semblable à celui d'une étoile. On distinguera donc les «nébuleuses à spectre de raies», encore appelées «nébuleuses gazeuses», car un tel spectre de raies caractérise ordinairement l'émission d'un gaz raréfié, et les «nébuleuses à spectre continu».

Spanish

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