Can Vader withstand planetary destruction?

Nihilus-style.

You mean endure Force Drain? I guess. If you mean an explosion that wipes out all life on a planet... no chance in hell.

Yeah; should've said Tyth-style.

No, and there's no way in hell Vader's resisting Nihilus' drain.

No.

Why would he be able to?

Because

Originally posted by Azronger
I can use whatever term I want. "The explosion of a superweapon" is perfectly accurate, since, well, the superweapon blew up.

Lol