Great Powers of the Universe
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The Great Powers of the Universe are a group of powers in the Marvel Universe. They are considered by Kubik to be the Celestials, Eternity, Death, Galactus, and the Living Tribunal, and also apparently includes such abstract entities as Mistress Love and Sire Hate, Kronos, Lord Chaos and Master Order, Infinity and Oblivion, to name just a few.
Even the Great Powers are said to be unable to know the fates of Adam Warlock and Thanos. It is possible that others are also unseeable to them.