Cosmic dust refers to small particles, or grains, found in space. These particles can vary in size from a few molecules to a few micrometers in diameter. Cosmic dust is made up of various materials, such as silicates, carbon, and ice. Studying cosmic dust is important because it provides insights into the formation and evolution of planets, stars, and galaxies. These particles play a crucial role in the creation of new stars and planetary systems, as they provide the material from which these structures form. Scientists study cosmic dust by collecting samples from comets, asteroids, and interstellar space. They analyze the composition of these particles using various techniques, such as spectroscopy and microscopy, to learn more about their properties and origins. Overall, research in cosmic dust is crucial for understanding the fundamental processes that drive the formation and evolution of the universe.