Mercury and Venus are the only two planets in our solar system that do not have a moon.
In our Solar System, that would be Mercury and Venus.
Within the Solar System, Earth is the only planet with one moon - The Moon.
None of those in out solar system do. Of the four terrestrial planets in our solar system, two have moons. Earth has one moon while Mars has two. The Jovian planets all have numerous moons.
do the densities of the solar system planets fall into two or more groups
# Ganymede - Moon of Jupiter # Titan - Moon of Saturn See related link for more information
Among the planets in the solar system the only two planets do not have any moon at all . And they are the planets Mercury and the planet Venus. Both these planets are nearer the sun compared to earth.
1). Halley's Comet 2). Earth's moon
Six out of the eight planets in our solar system have moons. (Mercury and Venus are the only two that do not.)
There are only two planets within our solar system that have no natural satellites (i.e. moons). They are Venus and Mercury; all other planets have at least one moon.
Only two planets have no moon. Mercury and Venus.
Pluto and Charon are the closest bodies in our solar system to an answer to this question, however, neither is a planet. Pluto used to be, but times change. When Pluto was a planet, it and its moon, Charon, were the closest in size of any of the planets. Currently the planet and moon with that distinction is the earth and its moon, the Moon. But no two bodies within our solar system which are classified as planets are considered double.