Originally posted by Val-E-DooshActually, it's a bit more than a Supernova. Superman, who has the senses to know - said the Sun Eater was the size of a Nebula, which range from something like seven hundred to well over a thousand light years across.
Superman showing some courage against a Sun Eater. Survives a supernova while drained.
Also, the sun eater causes suns to supernova as it 'eats' them. Evidence in Final Night. Earths Sun was going to Supernova as a smaller Sun eater tried to eat it. This suggests the explosion had to be much greater in nearly all capacities, and with more force than that to destroy the sun eater.
Otherwise Superman probably could have used heat vision to down it, lolol.
edit, Superman also suggested this thing was going to destroy several starsystems in pretty much one swipe it seemed.