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Дата изменения: Tue Jun 29 11:30:08 2004
Дата индексирования: Tue Dec 25 14:29:29 2007
Кодировка:

Поисковые слова: ngc 6559
In the Center of <b style="color:black;background-color:#ffff66">NGC</b> <b style="color:black;background-color:#66ffff">6559</b>
Astronomy Picture of the Day
    


In the Center of NGC 6559
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In the Center of NGC 6559
Credit: Adam Block (KPNO Visitor Program), NOAO, AURA, NSF
Explanation: Bright gas and dark dust permeate the space between stars in the center of a nebula known as NGC 6559. The gas, primarily hydrogen, is responsible for the diffuse red glow of the emission nebula. As energetic light from neighboring stars ionizes interstellar hydrogen, protons and electrons recombine to emit light of very specific colors, including the red hue observed. Small dust particles reflect blue starlight efficiently and so creates the blue reflection nebulosity seen near two of the bright stars. Dust also absorbs visible light, causing the dark clouds and filaments visible. NGC 6559 lies about 5000 light-years away toward the constellation of Sagittarius.

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

Based on Astronomy Picture Of the Day

Publications with keywords: NGC 6559 - reflection nebula
Publications with words: NGC 6559 - reflection nebula
See also:
All publications on this topic >>