[Dr.]

Originally Posted by The Ironstar

http://io9.com/5986180/the-8-incredi...=recirculation

The maximum (average) lung capacity for humans is about 6 liters. Even if we suppose 8 or 10 liters (because Supes is a large man) that wouldn’t be anywhere close to the quantity of air necessary to obliterate a star system. Also - if he just exhaled before he sneezed, there wouldn’t be any air to cause damage.