Thanos with a Cosmic Cube vs Galactus with the Ultimate Nullifier...
Thanos uses a Cosmic Cube (he uses the CCU that eventually became Kubik; this is the same CCU he used to imprison Chronos) to assume the physically most unharmable form he possibly can...
A well fed Galactus channels the his full power into making himself as impervious to injury as he possibly can...
At this point, using every ounce of will he possesses, Thanos orders the Cosmic Cube to utterly destroy Galactus...
At the exact same moment, Galactus furiously fires the Ultimate Nullifier at Thanos with the intention of utterly destroying him forever...
What is the result of this 'do-or-die' senario for both characters?