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20 euros AUSTRIA 2023 - The neutron star

€120,00 EUR

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20 euros AUSTRIA 2023 - The neutron star

Among the densest stellar objects in the universe, neutron stars are heavier than the sun itself. A magnificent representation of this unique galactic phenomenon, this little beauty weighs considerably less.

With a hemisphere at its center that curves inward on one side and outward on the other, the latest coin in The Uncharted Universe series is designed to be a simplified representation of that unique galactic phenomenon: the neutron star.

Reach the stars!

There are believed to be up to a billion neutron stars in the Milky Way. This figure is obtained by estimating the number of stars that have suffered a supernova explosion, a spectacular explosion of a massive star. Combined with gravitational collapse, this creates a compact, super-dense object known as a neutron star. After black holes, neutron stars are the densest stellar objects in the universe. Even denser than atomic nuclei, which is a good way to think of them, neutron stars are heavier than the Sun itself: a teaspoon of neutron star would weigh as much as 1,000 Cheops pyramids. Neutron stars can rotate at a very high speed, up to 700 revolutions per second, and have a magnetic field 12 to 15 orders of magnitude stronger than that of the Earth, which is a thousand to a million times stronger than the strongest magnetic field created by man. fields never produced.

Coin motif

The words "crust" and "core" are marked in German on the obverse of the coin. 'Crab pulsar' is the name of a neutron star that was created from a supernova in the year 1054, while '1.4 M' refers to the solar mass of the neutron star, '30rps' to its rotation speed per second and 'r~ 10km' at its radius. On the reverse of the coin, the neutron star stands out through a colored print and a stylized representation of its magnetic field.

When it comes to the exact composition of neutron stars, many things remain a mystery to scientists, but it is hoped that new insights will be gained by studying the expansion of the universe.

Nominal value



Special uncirculated


Silver (Ag 925)
Total weight

22.42 grams

Fine weight (ag)
20.74 grams