Dark matter is a form of matter that does not emit, absorb, or reflect light, making it invisible and detectable only through its gravitational effects on visible matter, such as stars and galaxies. It is thought to make up about 27% of the universe's total mass-energy content, while ordinary (baryonic) matter, which includes stars, planets, and gas, constitutes only about 5%.
The existence of dark matter was first proposed in the early 20th


