Joe Jakarta wrote:
M100 is 56 million light-years' distance, and Hubble dicovered Cepheids
there 10 years ago.
http://www.seds.org/Messier/more/m100_hst2.html

So where's the fun in 11 million lyr??


In addition to Brian Tung's reply about this being an elliptical
galaxy, the press release also mentions that the dustiness affects the
apparent magnitude and color of the Cepheids. I think the "fun" for
the invesigators was in doing the photometry and eliminating the
contaminating effect of dust to obtain a solution.

Tom