Besides silicate-based materials, what other primary compositional category defines cosmic dust grains?
Answer
Carbon-based materials
Cosmic dust particles are composed of various materials and are not uniform throughout the cosmos. They are fundamentally categorized into two main compositional types. The first type is silicate-based, meaning the particles contain oxygen along with elements such as magnesium, iron, and silicon. The second major classification category mentioned for these solid grains consists of carbon-based materials. These materials, alongside silicates, constitute the smallest solid matter distributed across the universe.

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