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Name: andrew g cantrell
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Date: 1993 - 1999


Question:
Is the moon ever truly full except during a total solar eclipse? Is there a reason that the oion nebula appears blue in my telescope?


Replies:
1) nope, the moon can't be full during a solar eclipse! (why?) [perhaps you were thinking of lunar eclipses?]

2) the Orion Nebula is one of the brightest of the emission nebulae or H II regions (the "H II" means ionized hydrogen). Emission nebula are usually reddish because they fluoresce by converting stellar UV radiation into the hydrogen Balmer lines, especially H-alpha which is in the red region of the visible spectrum. Why it appears blue could be due to many reasons having to do with your telescope, atmospheric conditions, Orion's elevation above the horizon, or it might actually be blue because of the presence of oxygen in the nebula.

[for those who don't know, the Orion Nebula is the middle "star" of the three making up "The Hunter's" sword hanging from his belt...

Unknown


AHA! there is a small cluster of 5 blue stars inside the nebula. reference: Whitney's Star Finder by C. A. Whitney, Alfred A. Knopf, 1977; a great little book for anyone interested in viweing the night sky; includes info on eclipses, sunrises and sunsets, comets, meteors, aurorae, rainbows, haloes, sundogs, and how to photograph all these.

Hawley



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