American Heritage Dictionary
(5)
Century Dictionary
(22)
GNU Webster's 1913
(1)
WordNet
(4)
Elsewhere on the web
The gas clouds in this nebula are unusual and complex, and aren't fully understood.— Universe Today
Its a planetary nebula, and the gas seen above composed the outer layers of a Sun-like star only— Universe Today
The outer layers of the star are going to drift away and form a beautiful planetary nebula, something like the Helix nebula (see image below: credit NASA).— Astronomy Cast
Dr. Manhattan must be hungry. it's a nebula, a vast structure of gas several light years across and located about 17,000 light years away from Earth.— Clipmarks | Live Clips

American Heritage Dictionary (1)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a year.
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