Here's why:

* Size: Multi-ring basins are the largest impact craters on planets and moons, with diameters exceeding 1,000 kilometers (621 miles).

* Formation: These immense structures form from the most energetic impacts, where the immense force of the impact creates multiple concentric rings around the central impact point.

* Examples: The largest known impact basin in the solar system is the South Pole-Aitken basin on the Moon, which is roughly 2,500 kilometers (1,553 miles) in diameter. Other examples include the Hellas Planitia on Mars and the Valhalla basin on Jupiter's moon Callisto.

While smaller craters like simple, complex, and peak ring craters are more common, multi-ring basins are the absolute giants of the impact world.