MARS IS RED & MOON IS WHITE

 

Because of chemistry

Mars is red because it has a lot of iron on its surface, and that iron likes to react with oxygen.

When iron and oxygen get together, they form iron oxide, also known as rust. Rust is red, or at least red-orange, depending on how much oxygen it has.

The moon, on the other hand, is white because it has very little iron and very little oxygen.

It's mostly made of silicates, which are minerals that contain silicon and oxygen. Silicates are usually gray or white, depending on how they reflect light.

You see, Mars is smaller than Earth, so it cooled down faster and didn't have a strong magnetic field to protect it from the solar wind.

The solar wind is a stream of charged particles that comes from the sun and can strip away a planet's atmosphere.

This thing obliterated Mars and left it without much of an atmosphere. Mars lost most of its water and carbon dioxide, which are sources of oxygen.

But it still had plenty of iron in its crust and mantle, which was exposed to the remaining oxygen in the air and in the rocks.

Over time, the iron oxidized and turned red.

The moon is even smaller than Mars, so it cooled down even faster and never had an atmosphere or a magnetic field to begin with.

It also formed from debris that was ejected when a gargantuan object hit the Earth eons ago.

That debris was mostly silicates, with very little iron or other metals.

The moon also didn't have much volcanic activity or water to bring up more metals or oxygen from its interior. So it stayed gray or white.

Short answer.:

Mars is rusty, the moon is dusty.