Mercury is an extreme: the smallest, the densest.
Because of their compact, rocky surfaces akin to Earth's terra firma, the planets Mercury, Venus, Earth, and Mars are referred to as terrestrial. The four planets closest to the sun are the terrestrial planets.
The seven classical planets, which can be seen with the unaided eye, were therefore familiar to early astrologers. The Sun, Mercury, Venus, the Moon, Mars, Jupiter, and Saturn are among them. The Moon and Sun were sometimes referred to as "the luminaries" or "the lights".
Features of common surfaces include:
Explosion craters (though rarer on bodies with thick atmospheres, the largest being Hellas Planitia on Mars)
On Venus, Earth, Mars, and Titan, dunes can be found.
both vulcanism and cryovolcanism.
Rilles.
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