Under a microscope, a cosmic dust particle appears as a tiny, irregular fragment, often less than a few micrometers in size. These particles, originating from comets, asteroids, and even interstellar space, exhibit a complex structure, with surfaces that can be rough, smooth, or porous. Composed of silicates, carbon compounds, and metals, they may show intricate, crystalline formations or amorphous, glass-like textures. Some cosmic dust particles contain embedded nanometer-sized grains, which reflect their ancient origins. Despite their small size, these particles hold valuable information about the early solar system and the processes that shaped the universe.