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All of them have moons.
If you count in pluto, there are 135 moons. If not, there are 134 moons.
No, not all planets in the solar system have moons. Mercury and Venus do not have any moons, while Earth has one moon, Mars has two moons, Jupiter has at least 79 moons, Saturn has at least 83 moons, Uranus has 27 moons, and Neptune has 14 moons.
The Moons of UranusCordeliaOpheliaBiancaCressidaDesdemonaJulietPortiaRosalindCupidBelindaPerditaPuckMabMirandaArielUmbrielTitaniaOberonFranciscoCalibanStephanoTrinculoSycoraxMargareProsperoSetebosFerdinand27 in all
Yes, the planet Mercury does not have any moons. This serves as a counterexample to the statement "all planets have moons."