The dark matter halo is a huge, invisible area that encompasses the whole visible portion of a galaxy, including its star disk, bulge, and other components. It extends well beyond the observable galaxy’s edge and is vital to the galaxy’s structural integrity.
Dark matter halos are essential for the development and stability of galaxies. During galaxy formation, dark matter’s gravitational influence attracts and accumulates gas and dust, resulting in the development of stars and other galactic components. The dark matter halo also stabilizes the galaxy, keeping it from collapsing because of the rapid rotation of its stellar disc.