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Mercury
It is approx 1550 km.
The most distinctive and longest feature on the planet Mercury is the Caloris Basin. It is multi ringed and covers about 840 miles in diameter.
Without an atmosphere to protect it from meteor impacts, the planet Mercury is heavily cratered. This includes the basin Caloris, which is a 1500-km wide impact crater with associated lava flows and crustal splitting.
The diameter od mercurys core is 3,600 km, 2,235 miles.
The Caloris basin is on the planet Mercury.
The Caloris Basin, also called Caloris Planitia, is a about 1,550 km (963 mi) in diameter.
Caloris Basin (also known as the Caloris Planitia) is an impact crater on Mercury about 1,550 km in diameter, known as the largest crater in the Solar System.
Mercury does.
Mercury
It is approx 1550 km.
I think the answer is the "Caloris Basin".
The main crater is Caloris Basin.
The Caloris Basin is a large impact crater found on the planet Mercury, 963 miles in diameter. Its one of the largest craters in the solar system.
Mercury doesn't have many geographically distinct features but it does have a feature called the Caloris Basin. The Caloris Basin is one of the largest meteor impact basins in the Solar System. It measures at about 1,550 kilometers or 960 miles in diameter. Since the Caloris Basin is the largest feature on Mercury it is also it's longest.
The Caloris Basin on Mercury is certainly one of the largest impact craters in the Solar System. As to the largest in the Milky Way - you'll just have to wait and see.
Caloris Basin I think is the deepest and the youngest too.