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Super-dense collapsed stellar cores pack enormous mass into tiny spheres. The figure is taken from ESA, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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A single teaspoon of a neutron star weighs billions of tonnes

Super-dense collapsed stellar cores pack enormous mass into tiny spheres

Neutron stars form when massive stars collapse during supernova explosions, squeezing protons and electrons into tightly packed neutrons. A sphere just 20 kilometres across contains more mass than the Sun, giving a single teaspoon of neutron star matter a weight of about six billion tonnes on Earth.

Where this comes from

ESA

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Tags: neutron star, density, supernova

A single teaspoon of a neutron star weighs billions of tonnes: the short answers

Where does this come from, and can I check it?: Super-dense collapsed stellar cores pack enormous mass into tiny spheres. The figure is taken from ESA, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a space fact?: Yes. It sits on the Space shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.