How did supernova SN 1987A differ from most other observed supernovae?
A) Supernova SN 1987A occurred in an external galaxy, not the Milky Way Galaxy.
B) Supernova SN 1987A reached a maximum luminosity ten times that of a normal supernova.
C) Supernova SN 1987A declined in brightness much faster than most supernovae.
D) Supernova SN 1987A was a blue supergiant when it blew up rather than the usual red supergiant.
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