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Astronomy Picture of the Day 20180222

3 comments, 305 views, posted 12:23 pm 23/02/2018 in Sci-Fi, Science & Space by evolution
evolution has 13736 posts, 6824 threads, 23 points
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When Roses Aren't Red

Not all roses are red of course, but they can still be very pretty. Likewise, the beautiful Rosette Nebula and other star forming regions are often shown in astronomical images with a predominately red hue, in part because the dominant emission in the nebula is from hydrogen atoms. Hydrogen's strongest optical emission line, known as H-alpha, is in the red region of the spectrum, but the beauty of an emission nebula need not be appreciated in red light alone. Other atoms in the nebula are also excited by energetic starlight and produce narrow emission lines as well. In this gorgeous view of the Rosette Nebula, narrowband images are combined to show emission from sulfur atoms in red, hydrogen in blue, and oxygen in green. In fact, the scheme of mapping these narrow atomic emission lines into broader colors is adopted in many Hubble images of stellar nurseries. The image spans about 100 light-years in the constellation Monoceros, at the 3,000 light-year estimated distance of the Rosette Nebula.

Image Credit & Copyright: Eric Coles and Mel Helm

Extra Points Given by:

Edorph (10), tamsnod27 (5), Flee (10), Paracelsus (10), LordViscera (25), MarcBS (5), REALITY (10)

Comments

1
1:53 am 24/02/2018

LordViscera

just beautiful

2
3:33 am 24/02/2018

MarcBS

Stunning! Is there some way Eric Coles and Matt Helm can be contacted about reprinting this photo?

0
9:18 am 24/02/2018

REALITY

Hi Marc, welcome to Teoti. I hope this helps...

Eric Coles and Mel Helm

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