Why do the craters on planets have the shape of a circle, although, undoubtedly, the impact of meteorites with the surface

Why do the craters on planets have the shape of a circle, although, undoubtedly, the impact of meteorites with the surface occurred at a variety of angles?

Lunar craters are of explosive origin. During the collisions of meteoric bodies with the planet’s surface, an almost instantaneous release of thermal energy occurs, which determines the central symmetry of the ejected matter.

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