<human>:  What elements make up dark matter?
<bot>: Dark matter is believed to consist mainly of non-baryonic matter, most of which is thought to be composed of some yet-unknown form of particle. Some of the most popular theories include Weakly Interacting Massive Particles (WIMPs), Axions, and Super-Symmetric particles. Generally, these particles are believed to interact primarily through gravity and have very little, if any, impact via the electromagnetic force.