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Introduction to the Solar System. Chapter 6. The Sun. Mass in Solar System. Solar System Temperatures. 350 F. 45 F. -390 F. Comparative Planetology. Categorize planets by properties Compare similarities and differences Ask: What physical processes can explain these properties?.

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Presentation Transcript
comparative planetology
Comparative Planetology
  • Categorize planets by properties
  • Compare similarities and differences
  • Ask: What physical processes can explain these properties?
planet orbits
Planet Orbits
  • Orbits aligned in same plane (the ecliptic)
    • Explains why planets always found in Zodiac
    • Pluto’s orbit tipped the most (17 degrees)
  • All planets orbit Sun counter-clockwise
  • Planets rotate counter-clockwise
    • except Venus
  • Rotation axis roughly perpendicular to orbit
    • except Uranus and Pluto
the scale of the solar system
The Scale of the Solar System

Workbook Exercise: “Sun Size” (p. 63-65 in Workbook)

slide9

The image at right shows a

  • picture of the Sun. The dark
  • spots located on this image
  • are sunspots. How does the
  • size of Earth compare to the
  • size of the sunspot that is
  • identified on the right side of
  • the image of Sun?
    • A) Earth and the sunspot
    • are about the same size.
    • B) The sunspot is much
    • larger than Earth.
    • C) The sunspot is much
    • smaller than Earth.

Sunspot

slide10

If you were constructing a scale model of the solar system that used a Sun that was the size of a basketball (approximately 12 inches in diameter), which of the following lengths would most closely approximate the scaled distance between Earth and the Sun?

    • A) 3 feet (length of an outstretched arm)
    • B) 10 feet (height of a basketball goal)
    • C) 100 feet (height of an 10 story building)
    • D) 300 feet (length of a football field)
terrestrial planets
Terrestrial Planets
  • Terrestrial = Earth-like
    • Mercury
    • Venus
    • Earth (and Moon)
    • Mars
  • Small, low mass
  • No large moons (except Earth)
    • Mars has two small ones…
  • Close to Sun
terrestrial planets1
Terrestrial Planets
  • Rocky Surface
    • High density (3-5 gm/cm3) (water = 1 gm/cm3)
  • Geologic Activity (volcanoes, continental drift)
    • Present on larger planets (Earth and Venus)
    • Absent on smaller planets (Moon, Mercury, and Mars)
  • Atmosphere
    • Little hydrogen and helium
    • Mostly carbon dioxide (Venus and Mars) or nitrogen (Earth)
    • Smaller planets have no atmosphere (Mercury, Moon)
asteroids
Asteroids

Mars

The Asteroid Belt

jovian planets
Jovian Planets
  • Jovian = Jupiter-like
    • Jupiter
    • Saturn
    • Uranus
    • Neptune
  • Large, massive
  • Many moons
  • Far from Sun
jovian planets1
Jovian Planets
  • Low density (1 gm/cm3)
  • No obvious surface
  • Atmosphere
    • Mostly hydrogen and helium
    • Other gases (methane, ammonia)
      • may form ices
the outer solar system
The Outer Solar System

Comets

Kuiper Belt and Oort Cloud