Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke6020.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 6020. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Interstellar Medium, Interstellar Medium Objects
Scientific paper
M20 is a diffuse nebula in Sagittarius known as the `TRIFID NEBULA'
because of its three-lobed appearance. It is situated roughly 2 degrees
northwest of M8. Messier described a `cluster of stars', William
Herschel assigned different numbers to different parts of the object and
John Herschel was the first to use the term `trifid'....
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