A natural satellite that currently orbits around Earth. The Moon is normally associated night time, and some say it possesses divine powers.
The Moon is the fifth largest satellite in the Solar System. To understand the physiology of the Moon, it's easiest to compare it to the Earth, which we are much more familar with. The Moon in size is a quarter (1/4) of Earth's diameter, and is 1/81 it's mass. To us, it's the brightest thing in the sky aside from the Sun, and it's the only celestial body that humans have landed on. Like the Earth, the Moon has a crust, mantle, and core body. Though unlike other satellites and celestial bodies in general, the core of the Moon is only 20% of its size, while most satellite's cores are 50% of their size.
The Moon's surface is covered in craters and basins, all of which are quite visible to the human eye in a clear night sky, easiest to see when the Moon is at it's full phase. The Moon also has a phase called the "New Moon", where the Moon isn't visible or is barely visible.