Kryptonite
no
Presumably any superhero could if they had Kryptonite.
no a lightsaber would not kill superman
Kryptonite is a fictional element from the Superman comics that generally has detrimental effects on Superman and other beings from the planet Krypton.See link below for article about Kryptonite in all its forms.
Superman must fly him to the air and punch him into space and let Wolverine lose his powers and let him die.
Krypton
Krypton
No.
Krypton was the element named after Superman's home planet.
superman killed badguys but not the inocent
Magnesium
kryptonite