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All the components of our solar system and universe function as a system. • Gravity is the force that holds our solar system and our universe together. • Our sun and our solar system is one of hundreds of billions in our galaxy and our galaxy is one of hundreds of billions in our universe. • As Technology (including telescopes, satellites, and space travel) expands so does our knowledge of our universe, but our knowledge and technology is limited.
Spickelmier, Courtney, "Our World in Space" (2008). Understanding by Design: Complete Collection. Paper 63.
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