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Galaxies
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. Galaxies range in size from dwarfs with just a few hundred million stars to giants with one hundred trillion stars, each orbiting its galaxy's centre of mass. Galaxies are categorized according to their visual morphology as elliptical, spiral, or irregular. Many are thought to have supermassive black holes at their centres.
Nebula
A a nebula is a cosmic cloud of gas and dust floating in space. They contain the elements from which stars and solar systems are formed. Enjoy our fantastic 3D fly throughs of emission, reflection, dark, planetary, and supernova remnant (SNR) nebula.