Ghosts of the Milky Way –“Have Our Galaxy 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 Ghosts of the Milky Way –“Have Our Galaxy Ringing Like a Bell”