Cosmic String

A cosmic string is a hypothetical, ultra-thin, and extremely dense filament in space, theorized to have formed shortly after the Big Bang due to energetic fluctuations. Think of it as a tiny but incredibly heavy thread stretching across the universe, with a mass so concentrated that it could warp space and affect the movement of light and matter nearby. While they haven't been directly observed, cosmic strings are important in theoretical physics because they might offer insights into the conditions of the early universe and the fundamental nature of space-time.