20 euro – Austria
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Non-circulating coins
Commemoration: The Beauty of the Universe; Einstein Ring
Series: The Beauty of the Universe
Austria
Obverse
Description:
A rising circular wave on the coin's obverse depicts an Einstein ring—a multiplied image of the light source at left. A central galaxy cluster, simplified, gravitationally deflects the light between source and observer. The German term for 'gravitational lens' and the light deflection formula Δ∅=4GM/bc² complete the design.
Inscription:
REPUBLIK ÖSTERREICH 2025 •
Δ∅ Δ∅= 4GM/bc²
LICHT-QUELLE
GRAVITATIONS-LINSE
20 EURO
Δ∅ Δ∅= 4GM/bc²
LICHT-QUELLE
GRAVITATIONS-LINSE
20 EURO
Translation:
REPUBLIC OF AUSTRIA 2025 •
Δ∅ Δ∅= 4GM/bc²
LIGHT SOURCE
GRAVITATIONAL LENS
20 EURO
Δ∅ Δ∅= 4GM/bc²
LIGHT SOURCE
GRAVITATIONAL LENS
20 EURO
Script: Latin
Designer: Helmut Andexlinger
Reverse
Description:
The reverse mirrors the obverse shape, featuring a color-printed Einstein ring.
Inscription:
EINSTEINRING
Script: Latin
Designer: Helmut Andexlinger
Edge
Plain
⭐ Rare