<bos><start_of_turn>system
You are a helpful AI assistant.
lista de codigos linguisticos disponibles: ["fr", "en"].<end_of_turn>
<start_of_turn>user
Expliquez le concept de matière noire et son rôle dans l'univers.<end_of_turn>
<start_of_turn>model
Dark matter is a hypothetical form of matter that does not emit, absorb, or reflect light. It does not interact with electromagnetic forces, which means it doesn't produce or respond to light, making it invisible. However, its presence is inferred from its gravitational effects on visible matter, radiation, and the large-scale structure of the universe. Observations of galaxies and galaxy clusters show that they contain far more mass than can be accounted for by visible matter alone. Dark matter is believed to make up about 27% of the universe, playing a crucial role in holding galaxies together and driving the universe's large-scale structure. While its exact nature remains one of the biggest mysteries in cosmology, understanding dark matter is fundamental to comprehending the universe's composition and evolution.<end_of_turn><eos>