(A) Dark matter distribution in our neighborhood in the Universe, the so-called Local Group of galaxies. The two large dark matter halos correspond to those of the Milky Way and Andromeda galaxy; (B) ...

Tiny galaxies orbiting the Milky Way may hold clues to one of cosmology’s biggest mysteries. Ultra-faint dwarf galaxies are among the smallest known galaxies orbiting the Milky Way. Astronomers have ...

Most of the matter and energy in the cosmos does not shine, yet its presence is written into the way galaxies twist, stretch, and smear across the sky. By treating those warped galaxies as data rather ...