Talk:Planetary nebula luminosity function

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A fact from Planetary nebula luminosity function appeared on Wikipedia's Main Page in the Did you know column on 18 September 2007. The text of the entry was as follows:

Did you know... that the planetary nebula luminosity function is an accurate standard candle (luminosity measurement) outside Earth's home galaxy, the Milky Way, despite an average error factor of two for distance estimates to planetary nebulae within this galaxy?

A record of the entry may be seen at Wikipedia:Recent additions/2007/September.

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