Question

why thor hammer is so heavy and why he only can pick it up not othrs

Answer 1

May be because the hammer can recognise his hand and if it is no his hand its weight increases. now you can posts question of  study purpose please

Answer 2

Answer:

It's not that Mjolnir is heavy, it's that it's immobile. The only one who can lift it is Thor, and as you see when Thor lifts it, it weighs as much as a normal hammer. It's just that when anyone else tries to lift it (excepting Steve cough), the hammer does not move.

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