Chapter 1 Our Place in the Universe - Astronomy

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More detailed study of the Milky Way’s rotation reveals one of the greatest mysteries in astronomy: Most of the galaxy’s light comes from stars and gas in the galactic disk and central bulge But measurements suggest that most of the mass lies unseen in the spherical halo that surrounds the entire disk This reveals the presence of a mass that we cannot see. It is called dark matter
How do galaxies move within the universe? Galaxies are carried along with the expansion of the universe. But how did Hubble figure out that the universe is expanding? The analogy of the raisin cake:
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 and 10: Nebula What is outside the solar sy
Page 11 and 12: Clusters of galaxies and superclust
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: How is our Sun moving in the Milky
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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