| A Brief History |
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| • | Initially
just a type of nebula |
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| • | Hubble
resolved stars in M31 (1920s) |
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| • | Many
mixed catalogs already existed |
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| – | Messier
(M – “fuzzy non-comets”), 39 of 109 |
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| – | New
General Catalog (NGC), 3200 of 7840 |
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| • | Today
there are many surveys/catalogs (see |
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| NED
entries while doing homework) |
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| – | SDSS
and 2dF (more later this semester) |
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