Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke3594.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 3594. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astronomy
History And Archaeoastronomy, Biographies
Scientific paper
Danish astronomer, born in Copenhagen, who, after working at Birr Castle in Ireland, became director of Armagh Observatory, studying the many nebulae he had previously observed at Birr. At a time when it was not clear whether spiral nebulae were inside our own Galaxy (the Milky Way) or were indeed, as was suspected, island universes outside, he established through careful measurements that they h...
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