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Unformatted text preview: gonna believe, the one or the many? M31 Stars, Galaxies and the Universe Maruša Bradač Shapley-Curtis Debate Argument in favor: why does M31 have so many novae anyway?
Possibly because it has billions of stars in it?
Rebuttal: we don't know what causes novae, so that doesn't prove
anything M31 Stars, Galaxies and the Universe Maruša Bradač Shapley-Curtis Debate Argument in favor: von Maanen detecte d M101 rotation in plane of
sky. If it were big, it would have to be rotating faster than spee d
Rebuttal: that's a ver y tricky measurement to make. Maybe he is
Photo: NASA/ESA, via Wikipe dia Stars, Galaxies and the Universe New Infor mation There are novae, an d there are supernovae. Maruša Bradač Stars, Galaxies and the Universe Maruša Bradač New Infor mation No one since von Maanen has ever detecte d rotation of M101. Stars, Galaxies and the Universe Maruša Bradač Pro of Hubble (1920's) measure d the distance to An drome da nebula (M31)
w ith Cepheids: a million light-years*
An drome da is the closest spiral nebula. These are islan d
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