As a subject matter expert in mythology and pop culture, I can provide an answer to your question about the weight of Thor's hammer, Mjolnir. In Norse mythology, the exact weight of Mjolnir is not specified, as it is a magical weapon and its weight is often described as being able to change depending on who is wielding it. Only those who are deemed worthy can lift it, and in the hands of an unworthy person, it is often said to be as heavy as a mountain.

In the Marvel Comics universe, which is a more concrete setting with specific measurements, Mjolnir is said to weigh exactly 42.3 pounds (19.2 kilograms) when held by someone who is unworthy. However, when wielded by Thor, who is worthy, it becomes as light as a feather.

To summarize, the weight of Thor's hammer is a matter of interpretation and context. In mythology, it is described in metaphorical terms, while in the Marvel Comics, it has a specific weight when not in the hands of its rightful owner.

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For example, Marvel �C which publishes the Thor comics �C issued a ��Thor's Hammer�� trading card in 1991 that states Mjolnir is made of Uru and weighs precisely 42.3 pounds. That's lighter than a herd of 300 billion mice, much less a herd of 300 billion elephants. But it raises a different science question.read more >>