Astronomers explain galactic motion with a dark matter sheet

Astronomers have solved a century-old puzzle explaining why most nearby galaxies recede from the Milky Way as if unaffected by its gravity. The solution lies in a vast, flat sheet of dark matter surrounding our galaxy, with empty voids above and below. This structure counteracts local gravitational pulls, making the expansion appear smoother than expected. This discovery, made through sophisticated computer simulations, reveals the intricate, non-random structure of the universe and how it influences galactic motion.