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Don't forget your towel today.
"Mjolnir itself is already extremely durable and nigh invulnerable like the Earth metal Adamantium or the Olympian metal Adamantine, and combined with the various enchantments placed upon it by Odin, is for all intents and purposes, indestructible. It has survived heat as extreme as the heart of Suns, blasts powerful enough to destroy planets, and it has contained energy sufficient enough to destroy an entire Galaxy and even energy sufficient enough to destroy one fifth of the Universe. Mjolnir also grants its user, such as Thor, countless mystical attributes and powers such as manipulation of the fundamental forces of the Universe such as the electromagnetic spectrum, gravity etc. Mjolnir can be used both offensively and defensively. Thor often uses the hammer as a physical weapon, with almost nothing being capable of withstanding a hammer blow or throw. It has been described as impacting with sufficient force to "destroy mountains" and has proven capable of shattering the armor of a Celestial. A rare exception is primary admantium.
A few other examples of the countless abilities Thor has shown with Mjolnir are: