Dark Matter and Light Interaction
Our understanding of dark matter—an elusive component making up roughly 27% of the universe—is deeply influenced by its unusual relationship with light. Unlike ordinary matter, dark matter neither emits, absorbs, nor reflects electromagnetic radiation, rendering it invisible and detectable only through gravitational effects.
Because light remains our primary tool for cosmic observation, dark matter’s lack of interaction profoundly challenges astronomers attempting to map its distribution and understand its nature. This absence of direct interaction compels scientists to rely on indirect clues, such as gravitational lensing and galaxy rotation curves, to unravel the mysteries of this enigmatic cosmic constituent.