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13 relations: Astronomy Picture of the Day, Canis Major, Emission nebula, Epoch (astronomy), European Southern Observatory, Gum catalog, Luminous blue variable, NGC 7635, Red supergiant star, Sharpless catalog, Supernova, Wolf–Rayet star, WR 7.
Astronomy Picture of the Day
Astronomy Picture of the Day (APOD) is a website provided by NASA and Michigan Technological University (MTU).
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Canis Major
Canis Major is a constellation in the southern celestial hemisphere.
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Emission nebula
An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths.
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Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
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European Southern Observatory
The European Southern Observatory (ESO) is a 15-nation intergovernmental research organization for ground-based astronomy.
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Gum catalog
The Gum catalog is an astronomical catalog of 84 emission nebulae in the southern sky.
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Luminous blue variable
Luminous blue variables (LBVs) are massive evolved stars that show unpredictable and sometimes dramatic variations in both their spectra and brightness.
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NGC 7635
NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia.
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Red supergiant star
Red supergiants are stars with a supergiant luminosity class (Yerkes class I) of spectral type K or M. They are the largest stars in the universe in terms of volume, although they are not the most massive or luminous.
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Sharpless catalog
The Sharpless catalog is a list of 313 HII regions (emission nebulae), intended to be comprehensive north of declination −27°.
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Supernova
A supernova (plural: supernovae or supernovas, abbreviations: SN and SNe) is a transient astronomical event that occurs during the last stellar evolutionary stages of a star's life, either a massive star or a white dwarf, whose destruction is marked by one final, titanic explosion.
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Wolf–Rayet star
Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of highly ionised helium and nitrogen or carbon.
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WR 7
WR 7 (HD 56925) is a Wolf–Rayet star in the constellation of Canis Major.
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Redirects here:
Gum 4, NGC 2361, Ngc 2359, Sh2-298, Sharpless 298, Thor's Helmet, Thor's Helmet Nebula, Thor's Helmet nebula, Thor's helmet.
