|| The Planet Quiz Show
Answer: Earth is the only planet with a single moon.
Earth’s moon is also the largest natural satellite in proportion to the diameter of its primary body (Earth: 7,925 miles in diameter; moon: 2,160 miles in diameter). An adequate comparison between the Earth and the moon would be the size and volume differences between a bowling ball and a golf ball.
Tally of Planetary Moons in our Solar System—166 total
|This picture was taken by the Galileo Spacecraft of the Earth and of its single moon, called the moon. Next to Earth our moon is darker, because its surface reflects much less light from the sun. Galileo was on its way to Jupiter, but using the Earth’s gravity to slingshot it even faster towards its goal. On its way to Jupiter, Galileo passed Venus once and the Earth twice. It also visited two asteroids, Gaspra and Ida.
|Say hello to the dwarf planet Pluto (lower left) and the largest of its three moons, Charon (upper right). This picture was taken with the Hubble Space Telescope which is in orbit around the Earth.
Back to the questions!