The Leviathan of Parsonstown

In the 1800s, William Parsons built a telescope larger than any in the world: The Leviathan of Parsonstown. This landmark in science history helped solve the mystery of just what a nebula could be.

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Sources:
http://bulletin-archive.kenyon.edu/x1446.html
http://articles.adsabs.harvard.edu//full/2002JHA....33...57H/0000057.000.html
https://www.britannica.com/topic/Messier-catalog
http://ecuip.lib.uchicago.edu/multiwavelength-astronomy/optical/history/06.html
https://www.historyireland.com/18th-19th-century-history/the-leviathan-of-parsonstown/
http://burro.case.edu/Academics/Astr222/Galaxies/Intro/debate.html

Images:
https://commons.wikimedia.org/wiki/File:Charles_Messier.jpg
https://en.wikipedia.org/wiki/File:M42m.jpg
https://commons.wikimedia.org/wiki/File:Image_taken_from_page_384_of_%27The_Half_Hour_Library_of_Travel,_Nature_and_Science_for_young_readers%27_(11301074156).jpg
https://en.wikipedia.org/wiki/File:Greate_Telescope,_Birr,_Offaly_2.jpg
https://www.nasa.gov/content/goddard/hubble-space-telescope-optics-system
https://www.nasa.gov/centers/marshall/multimedia/photos/2010/photos10-094.html
https://en.wikipedia.org/wiki/File:40-foot_telescope_mirror.jpg
https://en.wikipedia.org/wiki/File:Birr_Castle_by_Henrietta_Crompton.jpg
https://en.wikipedia.org/wiki/File:Rosse_six_foot_telescope_mirror.JPG
https://en.wikipedia.org/wiki/File:60%22_Mirror_for_William_Parsons,_Earl_of_Rosse_(9237613525).jpg
https://en.wikipedia.org/wiki/File:Lossy-page1-6940px-Lord_Rosse%27s_Great_Reflecting_Telescope,_at_Parsonstown,_Ireland_RMG_F8661_(cropped).jpg
https://commons.wikimedia.org/wiki/File:El_mundo_f%C3%ADsico,_1882_%22Telescopio_lord_Rosse,_en_Parsontown_(Irlanda)%22._(4051853437).jpg
https://en.wikipedia.org/wiki/File:Leviathan_of_Parsonstown..._(8392017304).jpg
https://commons.wikimedia.org/wiki/File:Telescopio_Leviatano_Birr.JPG
https://commons.wikimedia.org/wiki/File:M51Sketch.jpg
https://ned.ipac.caltech.edu/level5/March02/Gordon/Gordon2.html
https://en.wikipedia.org/wiki/File:PSM_V74_D518_Steel_building_and_60_inch_reflector.png