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Loading contentThe ultra-dense collapsed core of a massive star, packing more than the Sun's mass into a city-sized sphere.
When a massive star explodes as a supernova, its core can collapse into a neutron star — matter so dense a teaspoon would weigh billions of tonnes. Rapidly spinning, magnetised neutron stars are observed as pulsars.
| Typical mass | ≈ 1.4 M☉ in ~20 km | NASA |
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