Galaxy: An extended object composed of many stars and other matter.
Star: A a self-luminous gaseous celestial body.I guess I was just surprised at how pedantic it was.
Monday, July 14, 2008
Planet: A self-gravitating body that is nearly round
The other day I was looking at the Sloan Digital Sky Survey (SDSS) database table on photometric classification. I needed to recall which type was a star and which was a galaxy. So I was interested to see the following two listings in this table buried deep in the SDSS information:
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3 comments:
Looks like a brown dwarf is a star by their definition.
I guess they don't care why it's self-luminous. That makes life so much simpler.
Are planetary nebulae stars? Are globular clusters just many stars? This would make teaching intro astro so much easier.
Guess that's solved. Next problem!
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