Credit & Copyright: Gary Stevens
Explanation:
Double, double toil and trouble;
Fire burn, and cauldron bubble -- maybe
Macbeth should have consulted the Witch Head Nebula.
This suggestively shaped
reflection nebula
is associated with the
bright star Rigel in the
constellation Orion.
More formally known as
IC 2118,
the Witch Head Nebula glows primarily by light reflected from
Rigel, located just outside the top right corner of the
above image.
Fine dust
in the nebula reflects the light.
The blue color is caused not only by Rigel's blue
color but because the
dust grains reflect blue light more efficiently than red.
The same
physical process causes
Earth's daytime sky to appear blue,
although the scatterers in
Earth's atmosphere are molecules of
nitrogen and
oxygen.
The nebula lies about 1000 light-years away.
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& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: reflection nebula - IC 2118 - Witch Head Nebula
Publications with words: reflection nebula - IC 2118 - Witch Head Nebula
See also:
- The Light, the Dark, and the Dusty
- APOD: 2023 October 30 Á Reflections of the Ghost Nebula
- The Ghosts of Gamma Cas
- APOD: 2023 October 4 Á IC 2118: The Witch Head Nebula
- APOD: 2023 September 26 Á IC 4592: The Blue Horsehead Reflection Nebula
- NGC 7023: The Iris Nebula
- NGC 1333: Stellar Nursery in Perseus