Thanos HAZ nothing on the great maker. Galactus is a being older than the eternals, and more powerful. Looking at the powergrids for both characters, Galactus is the stronger fighter. (Cannot post pictures on my buggy comp). You really think with all the resources and power galactus has he cannot trap or kill Thanos, really? For someone who can eat worlds, Thanos is simply a chewy piece of gum. Yes, with the heart of the universe, Thanos did defeat Galactus in battle, along with other celestial fighters, but Thanos also destroyed the heart of the universe and thus destroyed his only chance of winning. Thanos's plots always revolve around him getting superpowerful items to make himself into a god, Galactus is already as powerful. From a straightforward fighting perspective, Galactus is simply too much for poor little Thanos.