A blue Sun is a star bigger than a yellow sun(our sun) but smaller than a red Sun (Rao).Kryptonians gain extra abilities and are even stronger then they are under a yellow sun.
Effects on KryptoniansEdit
If a Kryptonian is exposed to a enviroment under a blue sun,they will be even stronger then they already are making them one of the strongest being in the universe.Kryptonians also gain new abilities.One of this is Superman Vision.
Effects on HumansEdit
Humans are not effected by a blue sun,but if a Kryptonian under a blue sun blasts a human with superman vision,they will gain all Kryptonian powers temporarily and their weaknesses.