Mercury has the most craters in the Solar System, with approximately 763 craters. Any crater larger than 250km in diameter is referred to as a Basin.
The Caloris Basin is the largest impact crater on Mercury, covering approximately 1,550km in diameter and was discovered in 1974 by the Mariner 10 probe. It's one of the biggest impact sites in the solar system and the largest feature on Mercury's surface. It's so large in fact, that scientists believe this collision actually reshaped the topography on the opposite side of the planet.
The Caloris Basin is the largest impact crater on Mercury, covering approximately 1,550km in diameter and was discovered in 1974 by the Mariner 10 probe. It's one of the biggest impact sites in the solar system and the largest feature on Mercury's surface. It's so large in fact, that scientists believe this collision actually reshaped the topography on the opposite side of the planet.