Mercury: Mercury is the closest planet to the Sun and does not have any known moons.
Venus: Venus, the second planet from the Sun, also lacks any moons.
Mars: Mars has two small moons, Phobos and Deimos. Phobos is larger and closer to Mars, while Deimos is smaller and farther away.
Pluto: Pluto, once considered the ninth planet but now classified as a dwarf planet, has five known moons: Charon, Nix, Hydra, Kerberos, and Styx.
Eris: Eris, another dwarf planet, has one known moon, Dysnomia.
Haumea: Haumea, another dwarf planet, has two known moons, Hi'iaka and Namaka.
Makemake: Makemake, a dwarf planet, has one known moon, S/2015 (136472) 1.
In contrast to these planets and dwarf planets, Jupiter, Saturn, Uranus, and Neptune have numerous moons, with Jupiter having the most at 79 known moons.
