What would happen if the Sun exploded?

This question is based on the false premise that the Sun is the kind of star that will explode. It isn't, and astronomers have seen lots of stars explode! I prefer not to answer hypothetical questions like this because they are non-physical.

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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the
NASA IMAGE/POETRY Education and Public Outreach program.