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Almost anything you like. 125 cm * 250 cm * 100 cm of vacuum (or interstellar material) and the mass is near enough 0.

On the other hand, 125 cm * 250 cm * 100 cm of a neutron star will have a mass of many many tons. So pick your substance and you will get almost any mass you like.

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13y ago

What else can I help you with?