Big bang - Scientific explanation of how universe began as a hot, dense, violent burst of matter and energy, Cosmic horizon - Maximum distance (14 billion light years) one can see out into universe at a given time, Cosmic microwave background radiation - Radiation from the birth of universe, Cosmological Principle - Universe looks the same to every observer no matter where they are located. Universe has no center of expansion or edge from our perspective, Cosmology - The study of the structure and evolution of Universe, Dark matter - Galaxies attracted to _____ during galactic formation, Helium - Early universe so hot and dense that hydrogen fused into _____, Hubble’s law - Provides experimental evidence that universe is expanding. All distant galaxies rapidly moving away from us, Universe age - 14 billion years, Visible (observable) universe - The space within the cosmic horizon,

DT Cosmology 1

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