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Artist's illustration of an 'isolated neutron star' -- one without associated supernova remnants, binary companions or radio pulsations.

What would happen to a thimble full of a neutron star if you brought it to Earth?

... weirdest things. Something like two times the mass of our own Sun and yet it's concentrated into a tiny, tiny region ... then you have all of these neutrons, and neutrons on their own are not actually stable particles. They're going to try ...