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Is there a substance on earth that has a huge mass and small volume? I always hear about stuff in space weighing thousands of pounds, but is the size of a pea. If nothing exists, could we make it?

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Is there a substance on earth that has a huge mass and small volume? I always hear about stuff in space weighing thousands of pounds, but is the size of a pea. If nothing exists, could we make it?	1
If people landed on one of Jupiters moons, would the gravity from the planet be noticed by the people on the moon?	1