galactic halo

  • Recent Cosmic Collision Shakes Up Milky Way History

    Recent Cosmic Collision Shakes Up Milky Way History

    Evidence of the Milky Way’s past is encoded in wrinkles of stars, whose positions and movements have shifted as our galaxy has interacted with other galaxies, sometimes violently. Now, a team of astronomers say that the most recent of those cosmic collisions was billions of years later than was thought, making the Milky Way that…