Mint of Gdansk
Antique Finish, Printing UV, Meteorite, Reverse Concave
Description of obverse and reverse
The reverse of the coin shows a colourful representation of the appearance of a black hole. A real piece of meteorite is placed in the centre of the coin. The reverse of the coin is concave, which imitates the absorption of the surroundings by a black hole.
The obverse features Queen Elizabeth II.
A brief annotation
A black hole is a region of space-time which, due to the influence of gravity, nothing - including light and information - can leave. The black hole is surrounded by a mathematically defined surface called the event horizon, which marks the boundary of no return. It is called "black" because it completely absorbs light hitting the horizon, reflecting nothing.
As black holes cannot be observed directly, their presence is inferred from their interaction with surrounding matter and with light and other types of electromagnetic radiation.