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  2. Glossary of astronomy - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_astronomy

    A-type star In the Harvard spectral classification system, a class of main-sequence star having spectra dominated by Balmer absorption lines of hydrogen. Stars of spectral class A are typically blue-white or white in color, measure between 1.4 and 2.1 times the mass of the Sun, and have surface temperatures of 7,600–10,000 kelvin.

  3. Nova remnant - Wikipedia

    en.wikipedia.org/wiki/Nova_remnant

    Nova remnants when compared to supernova remnants or planetary nebulae generate much less both in energy and mass. They can be observed for perhaps a few centuries. [ 1 ] Notably, more nova remnants have been found with the new novae, due to improved imaging technology like CCD and at other wavelengths.

  4. 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 .

  5. GS-NDG-9422 - Wikipedia

    en.wikipedia.org/wiki/GS-NDG-9422

    This astronomy -related article is a stub. You can help Wikipedia by expanding it. v t e This physics -related article is a stub. You can help Wikipedia by expanding it.

  6. 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.

  7. Nova - Wikipedia

    en.wikipedia.org/wiki/Nova

    Artist's conception of a white dwarf, right, accreting hydrogen from the Roche lobe of its larger companion star A nova (pl. novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star (hence the name "nova", Latin for "new") that slowly fades over weeks or months.

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  9. Starlight - Wikipedia

    en.wikipedia.org/wiki/Starlight

    This effect was observed for light from the Crab Nebula by Martin, Illing and Angel. [19] An optically thick circumstellar environment can potentially produce much larger CP than the interstellar medium. Martin [18] suggested that LP light can become CP near a star by multiple scattering in an optically thick asymmetric circumstellar dust cloud.