Münze Österreich

20 Euro Silver Proof - The Uncharted Universe - The Neutron Star - Austria - 2023


20 Euro Silver Proof - The Uncharted Universe - The Black Hole - Austria - 2022

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Reference 7435

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Bank of Italy authorization n° 500823

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There are thought to be up to one billion neutron stars in the Milky Way. This figure is obtained by estimating the number of stars that have undergone a supernova explosion, a spectacular explosion of a massive star. Combined with gravitational collapse, this creates a compact and 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 teaspoonful of neutron star would weigh as much as 1,000 Cheops pyramids.

Neutron stars can rotate at 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 man-made magnetic fields ever produced.

The words ‘crust’ and ‘core’ are marked in German on the coin’s obverse. ‘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 neutron star’s solar mass, ‘30rps’ to its rotation speed per second and ‘r~10km’ to its radius. On the coin’s reverse, the neutron star bulges through a coloured imprint and a stylised representation of its magnetic field. As far as the exact composition of neutron stars is concerned, many things are still a mystery to scientists, but it is hoped that new insights will be gained by studying the expansion of the universe.

Proof Silver coin

  • Weight g. 22,42
  • Diameter mm. 34,00
  • Silver 925/1000
  • Mintage 30.000 pcs

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Data sheet

Issue Year 2023
Country Austria
Quality Proof
Type of Issue Silver Coins

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