Mercury and Venus are the only two planets in our solar system with zero moons—no natural satellites orbit them.
Moonless Planets:
1. Mercury:
- Closest planet to the Sun
- Too small and close to Sun to capture/retain moons
- Strong solar gravitational influence
2. Venus:
- Second planet from the Sun
- Similar reasons: proximity to Sun, gravitational dynamics
- No captured satellites
Why These Planets Have No Moons:
- Proximity to Sun: Strong solar gravity prevents moon capture
- Small size: Less gravitational pull to capture passing objects
- Formation history: Didn't accumulate satellites during formation
- Orbital dynamics: Unstable moon orbits near the Sun
All Other Planets:
- Earth: 1 moon
- Mars: 2 small moons
- Gas giants: Dozens to hundreds of moons
Importants Points:
- Zero moons: Mercury and Venus
- Reason: Too close to Sun, unfavorable gravitational conditions
- All others: Have at least one moon