You are seeing Ask web results for nebulae.
 [nĕb́yə-lə]
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Nebulae are huge, diffuse clouds of gas and dust in intergalactic space. The gas in nebulae (the plural of nebula) is mostly hydrogen. ... The gas in nebulae (the plural of nebula) is mostly hydrogen gas (H2). STELLAR NURSERY; A stellar nursery is a nebula ( a large cloud of hydrogen gas in space) in which star formation...
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Nebula - Wikipedia, the free encyclopedia
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Diffuse nebulae are clouds of interstellar matter, namely thin but widespread agglomerations of gas and dust. If they are large and massive enough they are frequently places of star formation, thus generating big associations or clusters of stars.
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William Herschel classified 79 of his objects as planetary nebulae, but only 20 of them actually are of this type, together with 13 others which he had classified differently, bringing his total to 33 to 1794. The next couple of discoveries was made in the 1820s, when Karl Ludwig Harding and William Herschel's son...
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Planetary nebula - Wikipedia, the free encyclopedia
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Planetary Nebulae ... The densities of these nebulae are typically 1.0E8 - 1.0E10 particles per meter3 and the expansion speed is about 20 - 30 km/s. After approximately 10,000 to 50,000 years (a short time, astronomically!) the density becomes too small for the nebula to be seen.
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Learn How Big Space Is With KidsAstronomy.com ... Learn About Nebulae With KidsAstronomy.com ; A nebulae is a cloud of gas and dust in outer space. These clouds are often very large, spanning across many light years. There are many different kind of nebulas in the sky.
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