The moon:

The Moon, otherwise known as Luna, is the only natural satellite of Earth. It was created 4.6 billion years ago, and it is widely accepted that it was created when Earth collided with a planet-sized object called Theia. It’s the fifth-largest moon in our solar system and is the second brightest object in the sky (after the Sun). The Moon Profile orbit: 384,400 km from Earth diameter: 3476 km mass: 7.35e22 kg History of The Moon Called Luna by the Romans, Selene and Artemis by the Greeks ... Learn how Earth's moon formed, how its orbit affects Earth's tides, why solar and lunar eclipses happen and the history of lunar exploration. The 8 lunar phases are: new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, & waning crescent. A moon is an object that orbits a planet or another celestial body that is not a star.