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In 1923, following the Great Debate, it became clear that many "nebulae" were in fact galaxies far from the Milky Way. Slipher and Edwin Hubble continued to collect the spectra from many different nebulae, finding 29 that showed emission spectra and 33 that had the continuous spectra of star light. [18]
Box Nebula NGC 6445: 1786 4.5 11.2 Sagittarius: Eye of Sauron Nebula M 1-42: 10 14 Sagittarius
The following articles contain lists of nebulae: List of dark nebulae; List of diffuse nebulae; List of largest nebulae; List of planetary nebulae;
However, there is currently only one case of a planetary nebula discovered in an open cluster that is agreed upon by independent researchers. [ 59 ] [ 60 ] [ 61 ] That case pertains to the planetary nebula PHR 1315-6555 and the open cluster Andrews-Lindsay 1.
Lyman alpha nebulae around quasars can have sizes between 15 kpc and 460 kpc. [1] Especially large Enormous Lyα nebula (ELAN) can have large sizes of ≳100 kpc. [ 2 ] Farina et al. 2019 table 5 has an extensive compilation of Lyman alpha nebulae around quasars. [ 1 ]
This is a list of diffuse nebulae. Most nebulae are diffuse , meaning that they do not have well-defined boundaries. Types of diffuse nebulae include emission nebulae and reflection nebulae .
Subsequently, William Herschel assembled a catalog of 5,000 nebulae. [34] In 1845, Lord Rosse examined the nebulae catalogued by Herschel and observed the spiral structure of Messier object M51, now known as the Whirlpool Galaxy. [44] [45] In 1912, Vesto M. Slipher made spectrographic studies of the brightest spiral nebulae to determine their ...
List of planetary nebulae; List of protoplanetary nebulae; S. List of supernova remnants This page was last edited on 9 May 2015, at 18:33 (UTC). Text ...