Summary: Endings and beginnings are seldom distinct events.
In time, scientists figured out the Trans-Life Equation, and with it, the technique to ascend an entire race from flesh to godhood, from this universe to the next, in one apocalyptic nanosecond that destroyed a world and rebuilt it in a dimension free from the constraints of matter and energy.
A vote was taken. All but one fanatic accepted the transition, a fanatic that not only rejected it for himself, but sent his child away just before the Moment of Light.
Those who were Kryptonian before becoming gods call the son of Jor-El the Pitied One.