A sugarcube of neutron star stuff weighs as much as all of humanity.

A neutron star is the cinder left when a giant star burns out and collapses on itself. Gravity overwhelms the electronic force that separates atoms from each other and crushes them into a mass ten trillion times denser than a lead brick. A single teaspoonful of neutron star material weighs as much as an ordinary mountain and is so dense that if it could be dropped over Earth it would fall like a stone through air, boring a hole in the planet as it fell.

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