Moon

the Moon (or Luna) is the only moon of Earth. she was no doubt as the most popular moon.

she is 1.28 light seconds from Earth. but her orbit will increase in the far future

she was not born alone. she had a twin. but her twin crashed into her forming a lot or craters on 1 side.

Earth's tidal forces lock her rotation. so her rotation has a time period the same as her orbital period. so her rotational/orbital period is 28 days.

Trivia

 * she was born 3.51 billion years go from a collision between Earth and Theia.
 * Neil Armstrong landed on her in 1969