Chapter 1 Our Place in the Universe - Astronomy

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Star (Sun) A large, plasma sphere that generates heat and light through nuclear fusion in its core. In the case of the sun, it fuses hydrogen into helium Plasma: Is a state of matter in which the matter is in ionized form. Composed of particles electrically charged. Normally composed of electrons (negative) and protons and ions (positive)
Planet Mars Neptune A moderately large object that orbits a star; it shines by reflecting light from the star. The constitution of planets may be rocky, icy, or gaseous in composition. We will discuss the formal definition given by the IAU (International Astronomical Union) later in the semester
Page 1 and 2: Chapter 1 Our Place in the Universe
Page 3: Solar System (in general planetary
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 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
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Chapter 1 Our Place in the Universe - Astronomy

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