SOLAR SYSTEM

Detailed explanation-1: -Impact craters dominate the surfaces of Mercury and the Earth’s Moon. Both bodies lack liquid water on their surfaces that would erode impact craters over time. They also lack an atmosphere which, on planets like the Earth and Venus, could disintegrate meteoroids before they impact the surface.

Detailed explanation-2: -Mercury is a rocky planet, also known as a terrestrial planet. Mercury has a solid, cratered surface, much like the Earth’s moon.

Detailed explanation-3: -On Mercury, where there is no atmosphere, there is no weather to erode away the craters, so most of the craters are still visible.

Detailed explanation-4: -Of the terrestrial (rocky) planets of the inner solar system, neither Mercury nor Venus have any moons at all, Earth has one and Mars has its two small moons. In the outer solar system, the gas giants Jupiter and Saturn and the ice giants Uranus and Neptune have dozens of moons.

Detailed explanation-5: -Among all the planets, Mercury is the one with no atmosphere.

Detailed explanation-6: -Mercury has more craters than any other planet, which means that, as the smallest planet, it also has the highest crater density.

Detailed explanation-7: -Titan is the only moon in the solar system known to have a substantial atmosphere, which is mostly nitrogen like Earth’s.