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Affichage des articles dont le libellé est Astronomy picture of the day - 2018 December 31 - The Witch Head Nebula. Afficher tous les articles
Affichage des articles dont le libellé est Astronomy picture of the day - 2018 December 31 - The Witch Head Nebula. Afficher tous les articles

31/12/2018

Astronomy picture of the day - 2018 December 31 - The Witch Head Nebula

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The Witch Head Nebula
 
Image Credit & Copyright: Digitized Sky Survey (POSS II); Processing: Utkarsh Mishra

Explanation: Double, double toil and trouble; Fire burn, and cauldron bubble .... maybe Macbeth should have consulted the Witch Head Nebula. A frighteningly shaped reflection nebula, this cosmic crone is about 800 light-years away though. Its malevolent visage seems to glare toward nearby bright star Rigel in Orion, just off the right edge of this frame. More formally known as IC 2118, the interstellar cloud of dust and gas is nearly 70 light-years across, its dust grains reflecting Rigel's starlight. In this composite portrait, the nebula's color is caused not only by the star's intense bluish light but because the dust grains scatter blue light more efficiently than red. The same physical process causes Earth's daytime sky to appear blue, although the scatterers in planet Earth's atmosphere are molecules of nitrogen and oxygen.

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