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  2. Nebula - Wikipedia

    en.wikipedia.org/wiki/Nebula

    A nebula (Latin for 'cloud, ... Most nebulae can be described as diffuse nebulae, which means that they are extended and contain no well-defined boundaries. [24]

  3. Planetary nebula - Wikipedia

    en.wikipedia.org/wiki/Planetary_nebula

    A typical planetary nebula is roughly one light year across, and consists of extremely rarefied gas, with a density generally from 100 to 10,000 particles per cm 3. [40] (The Earth's atmosphere, by comparison, contains 2.5 × 10 19 particles per cm 3.) Young planetary nebulae have the highest densities, sometimes as high as 10 6 particles per ...

  4. Dark nebula - Wikipedia

    en.wikipedia.org/wiki/Dark_nebula

    A dark nebula or absorption nebula is a type of interstellar cloud, particularly molecular clouds, that is so dense that it obscures the visible wavelengths of light from objects behind it, such as background stars and emission or reflection nebulae.

  5. Emission nebula - Wikipedia

    en.wikipedia.org/wiki/Emission_nebula

    Planetary nebulae, represented here by the Ring Nebula, are examples of emission nebulae. An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths. The most common source of ionization is high-energy ultraviolet photons emitted from a nearby hot star .

  6. Lists of nebulae - Wikipedia

    en.wikipedia.org/wiki/Lists_of_nebulae

    The following articles contain lists of nebulae: List of dark nebulae; List of diffuse nebulae; List of largest nebulae; List of planetary nebulae; List of protoplanetary nebulae; List of supernova remnants

  7. What animal do you see in this image of a nebula? - AOL

    www.aol.com/lifestyle/animal-see-image-nebula...

    This image of the Carina nebula shows only dust, ionized gases, and stars. Here are some puzzles and brainteasers to challenge your family and friends with, either in person or over video chat.

  8. Bok globule - Wikipedia

    en.wikipedia.org/wiki/Bok_globule

    In astronomy, Bok globules are isolated and relatively small dark nebulae containing dense cosmic dust and gas from which star formation may take place. Bok globules are found within H II regions, and typically have a mass of about two [1] to 50 solar masses contained within a region about a light year or so across (about 4.5 × 10 47 m 3). [2]

  9. Messier object - Wikipedia

    en.wikipedia.org/wiki/Messier_object

    The Messier catalogue comprises nearly all of the most spectacular examples of the five types of deep-sky object – diffuse nebulae, planetary nebulae, open clusters, globular clusters, and galaxies – visible from European latitudes. Furthermore, almost all of the Messier objects are among the closest to Earth in their respective classes ...