About How the Universe Works Season 1, Episode 3 : Galaxies (aka Alien Galaxies)

Documentary See more How the Universe Works seasons and episodes here

Galaxies, home to stars, planets and us, come in all shapes and sizes. Witnesses the evolution of galaxies; from clouds of cold gas floating in the voids of space 13 billion years ago, to the magnificent spirals that fill our night sky. Guest Stars: Lawrence Krauss, Michio Kaku, Michelle Thaller, Phil Plait,

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