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  2. Nebula - Wikipedia

    en.wikipedia.org/wiki/Nebula

    Similar nebulae not illuminated by stars do not exhibit visible radiation, but may be detected as opaque clouds blocking light from luminous objects behind them; they are called dark nebulae. [ 25 ] Although these nebulae have different visibility at optical wavelengths, they are all bright sources of infrared emission, chiefly from dust within ...

  3. Nebular hypothesis - Wikipedia

    en.wikipedia.org/wiki/Nebular_hypothesis

    The visible-light (left) and infrared (right) views of the Trifid Nebula—a giant star-forming cloud of gas and dust located 5,400 light-years away in the constellation Sagittarius Stars are thought to form inside giant clouds of cold molecular hydrogen — giant molecular clouds roughly 300,000 times the mass of the Sun ( M ☉ ) and 20 ...

  4. Interstellar cloud - Wikipedia

    en.wikipedia.org/wiki/Interstellar_cloud

    Reflection nebula IRAS 10082-5647 observed by the Hubble Space Telescope. These interstellar clouds possess a velocity higher than can be explained by the rotation of the Milky Way. [5] By definition, these clouds must have a v lsr greater than 90 km s −1, where v lsr is the local standard rest velocity.

  5. Scientists take first ever close-up picture of star outside ...

    www.aol.com/scientists-first-ever-close-picture...

    The dying star is located about 160,000 light-years from Earth, in a neighbouring galaxy called the Large Magellanic Cloud. ... called a nebula - apparently ejected by the star. A faint oval ring ...

  6. Molecular cloud - Wikipedia

    en.wikipedia.org/wiki/Molecular_cloud

    A molecular cloud, sometimes called a stellar nursery (if star formation is occurring within), is a type of interstellar cloud, the density and size of which permit absorption nebulae, the formation of molecules (most commonly molecular hydrogen, H 2), and the formation of H II regions.

  7. H II region - Wikipedia

    en.wikipedia.org/wiki/H_II_region

    The Large Magellanic Cloud, a satellite galaxy of the Milky Way at about 50 kpc (160 thousand light years), contains a giant H II region called the Tarantula Nebula. Measuring at about 200 pc (650 light years) across, this nebula is the most massive and the second-largest H II region in the Local Group. [36]

  8. Nebulae and Star Clusters - Wikipedia

    en.wikipedia.org/wiki/Nebulae_and_Star_Clusters

    A Nebula is a cloud of dust and gas inside a galaxy. Nebulae become visible if the gas glows, or if the cloud reflects starlight or obscures light from more distant objects. The catalogues that it may refer to: Catalogue des nébuleuses et des amas d'étoiles (Messier "M" catalogue) first published 1771

  9. Emission nebula - Wikipedia

    en.wikipedia.org/wiki/Emission_nebula

    An emission nebula is a nebula formed of ionized gases that emit light of various ... a young star will ionize part of the same cloud from which it was born, although ...