Question: is the moom always gray

Daniel Parsons answered on 12 Nov 2014:

The surface of the moon is generally a light grey colour, bit some parts of it are a darker grey. This is mainly controlled by variations in iron and titanium content. The flatter (mare) regions have low reflectance because they contain relatively high amounts of iron oxide (FeO) while some of the higher areas contain higher amounts of titanium oxide (TiO2) in addition to iron oxide, making for even lower reflectance and thus a bit darker.
The moon has a different appearance from the surface, from space and from the Earth. The colour of the moon that is seen in pictures from space most closely resembles the true colour of the moon – since Earth’s atmosphere does not interfere. Since there is less reflection from the sun during the daytime, the moon will often appear white from the Earth during the day. At night, the moon generally has a yellow tint to it. Depending on the time of year and atmospheric effects on Earth, the moon can take on a darker yellow tint.