1. The Moon is Earth's only permanent natural satellite
It is the fifth-largest natural satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits.

​

2. The Moon is the second-densest satellite
Among those whose densities are known anyway. The first densest is Jupiter's satellite Io. 

​

3. The Moon always shows Earth the same face
The Moon is in synchronous rotation with Earth. Its near side is marked by large dark plains (volcanic ‘maria’) that fill the spaces between the bright ancient crustal highlands and the prominent impact craters. Learn more about the Moon's phases

​

4. The Moon’s surface is actually dark
Although compared to the night sky it appears very bright, with a reflectance just slightly higher than that of worn asphalt. Its gravitational influence produces the ocean tides, body tides, and the slight lengthening of the day.​

​

5. The Sun and the Moon are not the same size
From Earth, both the Sun and the Moon look about same size. This is because, the Moon is 400 times smaller than the Sun, but also 400 times closer to Earth.

​

​

​

​

​

Courtesy of Royal Museum Greenwich, see more moon facts at https://www.rmg.co.uk/explore/interesting-facts-about-moon