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If you still don’t have a measure of how tiny we are, here is North America compared to Jupiter.

The original question was: I have heard Jupiter referred to as a failed star.  That if the cosmic chaos of the early solar system had worked out a little different, and Jupiter had gotten a bit more mass, it might have been able to light the fusion engine and become a star.
Two questions.
How close was Jupiter to becoming a star?
If something really big slammed into Jupiter today, could it trigger nuclear fusion?
Ok and a third question.  If Jupiter did in fact get slammed with something big enough to trigger nuclear fusion, and it became a star, how long would it take to substantially alter the ability for earth to sustain life as we know it?