This beautiful 1 Oz Silver coin is dedicated to the most mysterious element of the galaxies the Supermassive Black Hole, the largest type of black hole. The coin has a beautiful design, has a wonderful Relief, has a great coloration, has an Antique Finish quality and comes in a case, along with the Certificate of Authenticity. Limited mintage to only 999 pcs worldwide!The reverse of the coin features the wonderful coloured view of a Supermassive Black Hole with incredible swirling space debris. On top of the reverse, the inscriptions: SUPERMASSIVE BLACK HOLE the name of the coin and 2017 the year of issue. The obverse of the coin depicts the effigy of Her Majesty Queen Elizabeth II and the inscriptions: NIUE the issuing country, TWO DOLLARS the face value, 1oz. 999 SILVER the weight of the coin and the fineness of the Silver and ELIZABETH II the name of the Queen.
Supermassive Black Hole A supermassive black hole (SMBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses, and is found in the centre of almost all currently known massive galaxies. In the case of the Milky Way, the SMBH corresponds with the location of Sagittarius A. Supermassive black holes have properties that distinguish them from lower-mass classifications.
First, the average density of a SMBH (defined as the mass of the black hole divided by the volume within its Schwarzschild radius) can be less than the density of water in the case of some SMBHs. This is because the Schwarzschild radius is directly proportional to mass, while density is inversely proportional to the volume.Since the volume of a spherical object (such as the event horizon of a non-rotating black hole) is directly proportional to the cube of the radius, the minimum density of a black hole is inversely proportional to the square of the mass, and thus higher mass black holes have lower average density. In addition, the tidal forces in the vicinity of the event horizon are significantly weaker for massive black holes. As with density, the tidal force on a body at the event horizon is inversely proportional to the square of the mass: a person on the surface of the Earth and one at the event horizon of a 10 million black hole experience about the same tidal force between their head and feet. Unlike with stellar mass black holes, one would not experience significant tidal force until very deep into the black hole.
The item "SUPERMASSIVE BLACK HOLE 1 Oz Silver Coin 2$ Niue 2017" is in sale since Tuesday, November 7, 2017. This item is in the category "Coins & Paper Money\Coins\ World\Australia & Oceania\South Pacific".The seller is "powercoin_italy" and is located in Roma. This item can be shipped worldwide.