What type of radiation consists of tiny particles that move through space quickly?

Particulate radiation refers to radiation that consists of discrete particles, such as alpha particles, beta particles, and neutrons, which possess mass and charge. These tiny particles are emitted from radioactive materials and travel through space. Unlike electromagnetic radiation, which consists of waves and does not have mass (such as X-rays and gamma rays), particulate radiation has physical particles that can interact with matter more effectively due to their mass and charge.

While cosmic radiation is a subset of particulate radiation found in space, it specifically refers to high-energy particles from outer space and does not encompass all types of particulate radiation. Ionizing radiation includes both electromagnetic and particulate forms that have enough energy to strip electrons from atoms, leading to ionization. However, the question specifically asks about radiation that consists of small, fast-moving particles, making particulate radiation the most fitting answer.