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Nebulosity in Sagittarius
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Nebulosity in Sagittarius
Credit & Copyright: Anglo-Australian Telescope Board
Explanation: What causes the colors in this beautiful nebulosity in Sagittarius? Dubbed NGC 6589 and NGC 6590, the colors of this nebulosity, are caused by gas and dust. The blue color of the nebula nearest the bright stars is caused by reflection off interstellar dust. The dust emits little visible light of its own - in the absence of a nearby star the dust would appear dark, blocking light from background stars. The red color of the nebula furthest from the bright stars is caused by glowing hydrogen gas. Energetic light from the central stars ionizes hydrogen gas - which glows red when recombining with a local electron. In the absence of a nearby star, the gas would neither glow on its own nor absorb much background starlight.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Russkii tekst
Based on Astronomy Picture Of the Day
Publikacii s klyuchevymi slovami: emissionnaya tumannost' - otrazhatel'nye tumannosti - Strelec
Publikacii so slovami: emissionnaya tumannost' - otrazhatel'nye tumannosti - Strelec
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