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Goodness gracious, great balls of… oxygen?
Well, it was certainly born of fire. This is planetary nebula Abell 39, one of the largest spheres in the galaxy… it’s 2.6 light-years across! It really is that color blue. You’re seeing ionized Oxygen gas blown off by the dying star in its center. Look closely for the distant galaxies in the background, including…
NGC2403: An obscure galaxy in an obscure constellation.
About 10 million light-years away within the constellation Camelopardalis lies NGC2403. It doesn’t get much love, but it was really an oversight in the famous Messier catalog that defines the most popular deep-sky objects. So let’s give it a little attention, and reflect on the fact that the light we’re seeing from this galaxy started…
The Cave Nebula
Formally SH2-155, the Cave Nebula lies about 2,400 light-years away within the constellation Cepheus. It’s part of a much larger region of gas and dust (called a molecular cloud). This region is mostly ionized Hydrogen, but there’s just enough Oxygen – blue in this image – to make for a pretty picture. Capturing that Oxygen…
The Northern Trifid Nebula
Formally NGC1570, the “Northern Trifid” is a combination of an emission nebula (the red parts, which is ionized Hydrogen emitting its own light) and a reflection nebula (the blue parts, which is starlight reflecting off dust.) You can also see hints of the dust surrounding this area, which is difficult to capture under the light-polluted…
The Rosette Nebula, revisited
Had a couple of clear nights recently, and trained the ‘scope at the Rosette Nebula again. By combining this year’s data with last year’s, I created an image with a total 27 hours of exposure time! The Rosette Nebula is about 5,000 light-years away within the constellation Monoceros, and is the birthplace of the cluster…
Galaxies of the Hunting Dogs
The main galaxies in this image go by the unassuming names of NGC5033 and NGC5005 (5033 is the larger spiral galaxy.) They’re within a constellation named Canes Venatici, or “the hunting dogs.” Look closely, and you’ll spot a few other galaxies – some large but more distant, and some that are just really small and…
