Illustration of Lord Rosse's telescope. William Parsons, 3rd Earl of Rosse (1800-1867) was an Irish astronomer and engineer. He built what was then the largest telescope in the world on his estate at Birr (then known as Parsonstown), Offaly, Ireland. The instrument was known as 'the Leviathan of Parsonstown'. With it Lord Rosse discovered 15 spiral nebulae, and named the Crab nebula.

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Photo credit: © DETLEV VAN RAVENSWAAY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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