[zeestephen]

I cannot figure out why the moon would be a dull gray color.

It is reflecting direct sun light.

Shouldn't it be at least as bright as the Earth?

[KarlInOhio]

Shouldn't it be at least as bright as the Earth?

The moon reflects about 10% of the sunlight that hits it so it is dark gray. Earth reflects about 30% on average.

[Red Badger]

Albedo is different.

https://en.wikipedia.org/wiki/Albedo