Planetary Nebulae

Details Planetary Nebulae Planetary Nebulae

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke1858k&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 1858. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Stars, Stellar Models And Concepts

Scientific paper

Planetary nebulae, shells of illuminated gas that surround old and dying stars, were discovered by William Herschel, who in 1785 referred to the `planetary', or `disk-like', appearance of the object we now call NGC 7009 (figure 1). He later discovered that one of his `planetaries' (NGC 6543) had a central condensation or star. Some 2000 planetary nebulae are known today, the best known being the ...

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