Chapter 1 Our Place in the Universe - Astronomy

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Galaxy What is outside the Milky Way? A huge collection of stars in space, all held together by gravity and orbiting a common center. The Milky Way and the Andromeda galaxy are examples of galaxies M31, the great galaxy in Andromeda
Clusters of galaxies and superclusters • Groups of galaxies with more than a few dozen members are called galaxy clusters • Regions where galaxies and galaxy clusters are most tightly packed are called superclusters • Galaxy clusters and superclusters form giant chains and sheets with large voids between them
Page 1 and 2: Chapter 1 Our Place in the Universe
Page 3 and 4: Solar System (in general planetary
Page 5 and 6: Planet Mars Neptune A moderately la
Page 7 and 8: Asteroid A relatively small and roc
Page 9: Nebula What is outside the solar sy
Page 13 and 14: The observable Universe • The por
Page 15 and 16: The Big Bang and the expanding of t
Page 17 and 18: Let’s address the question: How c
Page 19 and 20: The meaning of a Light-Year • The
Page 21 and 22: How far is a light-year? 1light-yea
Page 23 and 24: Example: This photo shows the Andro
Page 25 and 26: Can we see the entire universe?
Page 27 and 28: Question Why can’t we see a galax
Page 29 and 30: What have we learned? • How can w
Page 31 and 32: Let’s reduce the size of the sola
Page 33 and 34: The scale of the solar system • O
Page 35 and 36: Answer: D, the distance across the
Page 37 and 38: Question Suppose you tried to count
Page 39 and 40: How big is the universe? • The Mi
Page 41 and 42: What have we learned? • How big i
Page 43 and 44: 1.3 Spaceship Earth Let’s explore
Page 45 and 46: How can we calculate the speed of a
Page 47 and 48: How is our Sun moving in the Milky
Page 49 and 50: How do galaxies move within the uni
Page 51 and 52: Edwin Hubble discovered in the 1920
Page 53 and 54: Are we ever sitting still?
Page 55: What have we learned? • How do ga

Chapter 1 Our Place in the Universe - Astronomy

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