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    • https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/34%3A_Frontiers_of_Physics/34.01%3A_Cosmology_and_Particle_Physics
      Cosmology is the study of the character and evolution of the universe. What are the major characteristics of the universe as we know them today? First, there are approximately 10¹¹ galaxies in the ob...Cosmology is the study of the character and evolution of the universe. What are the major characteristics of the universe as we know them today? First, there are approximately 10¹¹ galaxies in the observable part of the universe. An average galaxy contains more than 10¹¹  stars, with our Milky Way galaxy being larger than average, both in its number of stars and its dimensions.

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