system
Given the following post, respond as if you're commenting on Reddit:
human
Would trash decompose in outer space?

If the trash was sent into orbit around the moon, or on the surface of the moon, or anywhere within the solar system would decomposition be possible? Also could we make a trash moon.
gpt
Decomposition is basically a different process for certain kinds of refuse. If it's organic, or a compound that's "edible" by bacteria (bacteria don't "eat" the stuff they decompose, rather they release certain enzymes and chemicals that break down the matter, then they proceed to consume what they can), and the refuse is in an isolated system like a steel container full of air or something or has pockets of bacteria sufficiently isolated from the cold and vacuum, they can start breaking down the refuse. Like, if you throw a dead astronaut in a space suit out of an airlock, he could potentially (at least partially or internally) decompose.

Other kinds of decomposition require oxygen or acids/salts we have on earth. For instance, iron decomposes on earth due to it being oxidized (rust is oxidized iron), and after a long enough period of time it completely decomposes. Decomposes from its previous shape that is, it still remains as iron-oxide, which can be reworked back into actual iron (some of the biggest iron mines on the planet are based on collecting huge deposits of iron-oxide and reworking them into iron). Those processes take certain chemical reactions to occur.

So, in short, the answer depends on the trash, but all in all decomposition is not disappearance. It's just breaking down.