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# Big Bang Theory The Big Bang Theory is a cosmological model that explains how the universe began. - It suggests that the universe started its expansion about 13.8 billion years ago. - The concept of Big Bang as not a literal explosion of something leading to the creation of the universe. ## Big...
# Big Bang Theory The Big Bang Theory is a cosmological model that explains how the universe began. - It suggests that the universe started its expansion about 13.8 billion years ago. - The concept of Big Bang as not a literal explosion of something leading to the creation of the universe. ## Big Bang Theory and the Bread-Raisin Model - The bread represents the universe, while the raisins are galaxies. - The galaxies, represented by dots, are not expanding. The image shows two circles. The top circle is labeled, "A. Raisin bread dough before rising". It's 30 cm across and has 8 black dots representing the galaxies. The bottom circle is labeled, "B. Raisin bread dough after rising". It's 60cm across and has 10 black dots.
