We present the second coin of the ” Universe ” series, which depicts unusual elements of the cosmos. This time the coin focuses on the theme of a black hole. A black hole is a region of space-time which, due to the influence of gravity, nothing – including light and information – can leave. General Theory of Relativity. It requires the accumulation of a sufficiently large mass in a sufficiently small volume in order to form. The black hole is surrounded by a mathematically defined surface called the. 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. 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 mintage of the coin is limited to 500 pieces only. The coin comes packed with a c ertificate of authenticity in an elegant wooden box. 2021 Niue Universe Series Black Hole 2oz Silver Antiqued Coin. We present the second coin of the “Universe” series, which depicts unusual elements of the cosmos. According to the General Theory of Relativity, it requires the accumulation of a sufficiently large mass in a sufficiently small volume in order to form. The black hole is surrounded by a mathematically defined surface called the event horizon, which marks the boundary of no return. The coin comes packed with a certificate of authenticity in an elegant wooden box. Sorry, our items are NOT available for pick-up. No additional information at this time. You might also like. 2022 Niue Lunar Year of the Tiger Colorized Proof 1 oz Silver Coin NGC PF 70 UCA. 2020 Tuvalu Homer Simpson. 5oz Silver Colorized Coin NGC MS 70. 2021 Tuvalu Gods of Olympus Hades 1oz Silver Coin NGC MS 70. 2019 Marvel Comics The Avengers #1 Foil 1oz Silver CGC 9.8 w/Tin.