So Superman deflects a Soviet nuclear missile and hit with the blast. Which badly injured him and the detonation creates an electromagnetic pulse that wipes out all electrical equipment in the United States, and causes a nuclear winter. Then he grabs a flower and sucks the life out of all the plants nearby to make him well again.
Well it's said afterwards that he is not at full power because of the nuclear winter blocking sunlight. Well my question is couldn't he just fly into the earth thermosphere or higher to get a greater concentration of sunlight to be at full power again?