Why is the Milky Way Ringing Like a Bell

  Our galaxy is still ringing like a bell from a galactic collision that possibly occurred within the last 100 million years, when a small satellite galaxy or clump of invisible dark matter plowed through the Milky Way, leaving behind the ringing echoes, according to observations from the Sloan Digital Sky Survey (SDSS) telescope in … Continue reading Why is the Milky Way Ringing Like a Bell