Year of the Comet
Comet C/2011 L4 (PANSTARRS)

PANSTARRS information

Comet C/2012 S1 (ISON)

ISON information

Ask Astro

Published: January 1, 2005
There is no clear answer. The seeds of catastrophe that will destroy a star in a supernova are buried deep in the star's heart, but all we can see easily is the surface, buffered by the stellar mass in between. There were images of SK –69°202, the star that blew up as SN 1987A, but no clue in those images of an impending eruption.
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