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Astronomers believe our Universe began in a Big Bang, and is expanding around us. Brian will describe the Universe that we live in, and how astronomers have used observations to trace our Universe's history back more than 13 billion years. We are jus...
The Origin of Galaxies
Curiously, the structures and origins of galaxies remain one of the least understood areas of astronomy. Stellar structure and evolution are known very well, and so is the evolution of the Universe as a whole. Fortunately we can actually observe the ...