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The weight of a teaspoonful of neutron star is 6 billion tonnes.
A neutron star is the detritus of a huge star that has depleted its fuel. The dying star explodes as a supernova, while its core collapses in on itself owing to gravity, resulting in the formation of a super-dense neutron star. Astronomers use solar masses to measure the mind-bogglingly huge masses of stars and galaxies, with one sun mass equaling the mass of the Sun (that is, 2 x 1030 kilograms/4.4 x 1030 pounds). A typical neutron star has a mass of up to three solar masses packed into a sphere with a radius of around ten kilometres (6.2 miles), resulting in some of the densest stuff in the known cosmos.