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2000 Australia 9.5 trillion km Andromeda Galaxy Astronomers think billion galaxies billion stars black hole bottom called cannibal galaxies Centaurus centers of galaxies closely packed stars cloud of gas clouds of dust cluster of galaxies collections of stars computer-enhanced picture constellation Coma Berenices dim stars dust and gas dust clouds dwarf galaxies elliptical galaxies explode foggy patches four spiral arms galaxies collide galaxies was discovered Gareth Stevens gas and dust giant galaxies globular cluster gravity hundred billion imaginary planet Inset island universes Kant Large Magellanic Cloud larger cluster Left light travels light-years from Earth miles 9.5 trillion Milky Way Galaxy Milky Way's million light-years missing mass Museum nearly 6 trillion nebula Opposite Orion arm Perseus Sagittarius arm seen Small Magellanic Cloud Solar System Sombrero Galaxy spiral galaxy star clusters stars form stars that circle Sun is located thousand galaxies trillion miles 9.5 vast clouds visible white dwarf