Nebula (English Wikipedia)

Philosophical Transactions. T.N. 1786. p. 457.
Watts, William Marshall; Huggins, Sir William; Lady Huggins (1904). An introduction to the study of spectrum analysis. Longmans, Green, and Co. pp. 84–85. Retrieved 2009-10-31.
F. H. Shu (1982). The Physical Universe. Mill Valley, California: University Science Books. ISBN 0-935702-05-9.

books.google.com (Global: 3^rd place; English: 3^rd place)

Clark, Roger N. (1990). Visual astronomy of the deep sky. Cambridge University Press. p. 98. ISBN 9780521361552.

doi.org (Global: 2^nd place; English: 2^nd place)

Lundmark, K (1921). "Suspected New Stars Recorded in the Old Chronicles and Among Recent Meridian Observations". Publications of the Astronomical Society of the Pacific. 33 (195): 225. Bibcode:1921PASP...33..225L. doi:10.1086/123101.
Hoskin, Michael (2005). "Unfinished Business: William Herschel's Sweeps for Nebulae". British Journal for the History of Science. 43 (3): 305–320. Bibcode:2005HisSc..43..305H. doi:10.1177/007327530504300303. S2CID 161558679.
Hubble, E. P. (December 1922). "The source of luminosity in galactic nebulae". Astrophysical Journal. 56: 400–438. Bibcode:1922ApJ....56..400H. doi:10.1086/142713.
Sahai, Raghvendra; Sánchez Contreras, Carmen; Morris, Mark (2005). "A Starfish Preplanetary Nebula: IRAS 19024+0044" (PDF). The Astrophysical Journal. 620 (2): 948–960. Bibcode:2005ApJ...620..948S. doi:10.1086/426469.

eso.org (Global: 3,034^th place; English: 2,650^th place)

Kunitzsch, P. (1987), "A Medieval Reference to the Andromeda Nebula" (PDF), ESO Messenger, 49: 42–43, Bibcode:1987Msngr..49...42K, retrieved 2009-10-31

etymonline.com (Global: 287^th place; English: 321^st place)

Harper, Douglas. "nebula". Online Etymology Dictionary.

harvard.edu (Global: 18^th place; English: 17^th place)

ui.adsabs.harvard.edu

Kunitzsch, P. (1987), "A Medieval Reference to the Andromeda Nebula" (PDF), ESO Messenger, 49: 42–43, Bibcode:1987Msngr..49...42K, retrieved 2009-10-31
Harrison, T. G. (March 1984). "The Orion Nebula – where in History is it". Quarterly Journal of the Royal Astronomical Society. 25 (1): 70–73. Bibcode:1984QJRAS..25...65H.
Lundmark, K (1921). "Suspected New Stars Recorded in the Old Chronicles and Among Recent Meridian Observations". Publications of the Astronomical Society of the Pacific. 33 (195): 225. Bibcode:1921PASP...33..225L. doi:10.1086/123101.
Mayall, N.U. (1939). "The Crab Nebula, a Probable Supernova". Astronomical Society of the Pacific Leaflets. 3 (119): 145. Bibcode:1939ASPL....3..145M.
Hoskin, Michael (2005). "Unfinished Business: William Herschel's Sweeps for Nebulae". British Journal for the History of Science. 43 (3): 305–320. Bibcode:2005HisSc..43..305H. doi:10.1177/007327530504300303. S2CID 161558679.
Struve, Otto (1937). "Recent Progress in the Study of Reflection Nebulae". Popular Astronomy. 45: 9–22. Bibcode:1937PA.....45....9S.
Slipher, V. M. (1912). "On the spectrum of the nebula in the Pleiades". Lowell Observatory Bulletin. 1: 26–27. Bibcode:1912LowOB...2...26S.
Hubble, E. P. (December 1922). "The source of luminosity in galactic nebulae". Astrophysical Journal. 56: 400–438. Bibcode:1922ApJ....56..400H. doi:10.1086/142713.
Sahai, Raghvendra; Sánchez Contreras, Carmen; Morris, Mark (2005). "A Starfish Preplanetary Nebula: IRAS 19024+0044" (PDF). The Astrophysical Journal. 620 (2): 948–960. Bibcode:2005ApJ...620..948S. doi:10.1086/426469.
Kastner, J. H. (2005), "Near-death Transformation: Mass Ejection in Planetary Nebulae and Protoplanetary Nebulae", American Astronomical Society Meeting 206, #28.04; Bulletin of the American Astronomical Society, 37, Bibcode:2005AAS...206.2804K

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Mayall, N.U. (1939). "The Crab Nebula, a Probable Supernova". Astronomical Society of the Pacific Leaflets. 3 (119): 145. Bibcode:1939ASPL....3..145M.

nasa.gov (Global: 75^th place; English: 83^rd place)

trs.jpl.nasa.gov

Sahai, Raghvendra; Sánchez Contreras, Carmen; Morris, Mark (2005). "A Starfish Preplanetary Nebula: IRAS 19024+0044" (PDF). The Astrophysical Journal. 620 (2): 948–960. Bibcode:2005ApJ...620..948S. doi:10.1086/426469.

seds.org (Global: 5,388^th place; English: 7,494^th place)

messier.seds.org

"The Messier Catalog: Diffuse Nebulae". SEDS. Archived from the original on 1996-12-25. Retrieved 2007-06-12.

semanticscholar.org (Global: 11^th place; English: 8^th place)

api.semanticscholar.org

Hoskin, Michael (2005). "Unfinished Business: William Herschel's Sweeps for Nebulae". British Journal for the History of Science. 43 (3): 305–320. Bibcode:2005HisSc..43..305H. doi:10.1177/007327530504300303. S2CID 161558679.

spacecenter.org (Global: low place; English: low place)

"What is a nebula?". Space Center Houston. March 19, 2020. Retrieved June 27, 2021.

spacetelescope.org (Global: 8,860^th place; English: 6,620^th place)

"A stellar sneezing fit". ESA/Hubble Picture of the Week. Retrieved 16 December 2013.

thefreedictionary.com (Global: 614^th place; English: 572^nd place)

American Heritage Dictionary of the English Language, Fifth Edition. S.v. "nebula." Retrieved November 23, 2019, via https://thefreedictionary.com/nebula
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014. S.v. "nebula." Retrieved November 23, 2019, via https://thefreedictionary.com/nebula
Random House Kernerman Webster's College Dictionary. S.v. "nebula." Retrieved November 23, 2019, via https://thefreedictionary.com/nebula
The American Heritage Dictionary of Student Science, Second Edition. S.v. "nebula." Retrieved November 23, 2019, via https://thefreedictionary.com/nebula

universetoday.com (Global: 3,691^st place; English: 3,233^rd place)

Howell, Elizabeth (2013-02-22). "In Reality, Nebulae Offer No Place for Spaceships to Hide". Universe Today.

web.archive.org (Global: 1^st place; English: 1^st place)

"The Messier Catalog: Diffuse Nebulae". SEDS. Archived from the original on 1996-12-25. Retrieved 2007-06-12.

Nebula (English Wikipedia)

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