Why were astronomers originally led to believe that the energy producing region of a quasar must be small?About how many solar masses is the Supermassive black hole in the giant elliptical galaxy M87 in the center of the Virgo Cluster of galaxies?
Short answer questions: (a) Name a galaxy besides our own that can be seen with the naked eye? (b) What do astronomers attribute the ring of the cartwheel galaxy to? (c) About how many times more luminous are powerful quasars compared to the Sun? (d) About how many times more luminous are powerful quasars compared […]