The Moon is Earth's only natural satellite.

Here are some of the Moon's key features:

• Natural Satellite: The Moon orbits Earth and is bound to it by gravity.
• Size: The Moon is approximately one-quarter the diameter of Earth.
• Brightness: The Moon reflects sunlight, making it appear bright in our sky. Its phases change depending on its position relative to the Sun and Earth.
• Lunar Surface: The Moon's surface is characterized by craters, mountains, and smooth plains called maria, which were formed by ancient volcanic activity.
• Lunar Exploration: The Moon has been visited by robotic probes and human missions, including the Apollo missions. These missions have provided valuable insights into the Moon's composition, origin, and history.

For more information you can visit NASA's Moon Exploration site and ESA's Moon Exploration site.