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The Butterfly Nebula - NASA
The bright clusters and nebulae of planet Earth's night sky are often named for flowers or insects. Though its wingspan covers over 3 light-years, NGC 6302 is no exception. With an estimated surface temperature of about 250,000 degrees C, the dying central star of this particular planetary nebula has become exceptionally hot.
https://www.nasa.gov/multimedia/imagegallery/image_feature_2526.html
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What is a Planetary Nebula? - Planetary Nebula Definition
Planetary nebulae are the cloudy remnants of smaller stars that have shed their outer layers of gas, but haven't exploded into supernovas.
http://www.space.com/17715-planetary-nebula.html
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Nebula Facts, Information, Pictures - Encyclopedia
Facts, information and pictures of nebulae.
http://www.encyclopedia.com/topic/nebula.aspx
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Emission, Dark, and Reflection Nebulae: Video and Lesson Transcript - Study
Did you ever hear about the famous Horsehead Nebula? Do you know why it looks dark like that and why the colors around it are such a pretty pink?
http://study.com/academy/lesson/emission-dark-and-reflection-nebulae.html
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Celestial Objects Our Cosmic Neighbors
A nebula is a cosmic cloud of gas and dust floating in space. More than one nebula are called nebulae. Nebulae are the basic building blocks of the universe where new stars and star systems are born.
http://www.seasky.org/celestial-objects/nebulae.html
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Nebulae: Astronomy For Kids - Kids Astronomy
Learn How Big Space Is With Kids Astronomy.
http://www.kidsastronomy.com/nebulae.htm
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Nebulas: Nebula Pictures and Facts - Solar System Quick
Facts and information about nebulae. What are they, how do they form, what different kinds of nebulae are there, how do they create stars?
http://www.solarsystemquick.com/universe/nebulae.htm
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What Is A Nebula? - Universe Today
If we translate the Latin word nebula', it would simply mean cloud'. The nebula that we are about to talk about, however, is so much more than just a cloud.
http://www.universetoday.com/61103/what-is-a-nebula/
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Picture Album: Nebulae - Hubblesite
Photo album of nebulae gathered from the Hubble space Craft.
http://hubblesite.org/gallery/album/nebula
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Nebula - Wikipedia, the Free Encyclopedia
A nebula (Latin for "cloud";[2] pl. nebulae, nebulæ, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, nebula was a name for any diffuse astronomical object, including galaxies beyond the Milky Way.
https://en.wikipedia.org/wiki/Nebula
