Galaxies & the Universe Modified by D. Dailey Hewitt-Trussville High School.
What is a Galaxy? A galaxy is made of billions of stars, dust, and gas all held together by gravity.A galaxy is made of billions of stars, dust, and gas.
Active Galactic Nuclei Thomas Schlenker University of Washington Department of Physics PHYS 496 -What is an AGN? -What kinds of AGN’s are out there? -Unified.
