usatoday: @nasa is calling today #BlackHoleFriday. This is a drawing of a black hole named Cygnus X-
usatoday: @nasa is calling today #BlackHoleFriday. This is a drawing of a black hole named Cygnus X-1. It formed when a large star caved in and pulls matter from the blue star beside it, NASA says. Credit: NASA/CXC/M.Weiss #NASA #Space #Blackhole #blackholes -- source link