How did SN 1987A differ from most other observed supernovae?
A) SN 1987A occurred in an external galaxy, not the Milky Way Galaxy.
B) SN 1987A reached a maximum luminosity several times that of a normal supernova, because it exploded as a red supergiant.
C) SN 1987A declined in brightness much faster than most supernovae.
D) SN 1987A reached a maximum luminosity much later than a normal supernova, because it exploded as a blue supergiant.
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