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The Solar System



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Chapter 7 : The Solar System



The Solar System arrow_upward


  • 1st Star: The Sun.
  • 8 Planets + a few minor planets.
    • 126 Moons around these planets.
    • Asteroids, Meteoroids and Comets.
  • A lot of nearly empty space.
  • The solar system is very flat.
  • Planetary orbits are nearly circular.
  • Almost all moons and planets (and Sun) rotate and revolve (orbit) in the same direction.
  • Planets are isolated in space.
  • Leftover STUFF exists in the solar system (Comets and Asteroids).

  • Sun, Planets and Moon to Scale arrow_upward



    Planets arrow_upward


  • An Easy Mnemonic:

  • Mother

    Mercury

    Very

    Venus

    Easily

    Earth

    Made

    Mars

    Jam

    Jupiter

    Sandwich

    Saturn

    Using

    Uranus

    Nectarines

    Neptune


  • Two Kinds of Planets:

  • Terrestrial Planet

    Jovian Planet

    Mercury

    Jupiter

    Venus

    Saturn

    Earth

    Uranus

    Mars

    Neptune



  • Nebular Theory

  • Terrestrial Planet

    Jovian Planet

    Distance from the Sun

    Close to the Sun

    Far from the Sun

    Size

    Small

    Large

    Composition

    Mostly Rocky

    Mostly Gaseous

    Density

    High Density

    Low Density

    Rotation Rate

    Slow Rotation (1 - 243 days)

    Fast Rotation (0.41 - 0.72 days)

    Number of Moons

    Few Moons

    Many Moons

    Rings

    No Rings

    Rings

    Heavy or Light Elements

    Heavier Elements

    Main Elements H, He



    Comets arrow_upward


  • Comets are bright, fuzzy objects that appear relatively suddenly.
  • Most usually have a rather long, diffuse tail.
  • The Nature of Comets:

  • The Comet Structure arrow_upward


  • Nucleus
  • Coma
  • Tail

  • The Meteors arrow_upward


  • A small body of matter from outer space that enters the earth's atmosphere, appearing as a streak of light.
  • Things that fall from the sky are called the Meteors.
  • There are many small chunks of matter orbiting around the Sun.

  • Meteor Showers arrow_upward


  • During periods of high meteor activity, most of the events appear to come from one spot on the sky.
  • This point is roughly where the comet’s tail was. 
  • Dust particles enter the atmosphere and burn up, causing a streak of light.

  • Asteroids arrow_upward


  • Asteroid Belt

  • How did the Solar System form? arrow_upward


  • The Nebular Hypothesis is the most widely accepted model explaining the formation and evolution of the Solar System.
  • There is evidence that it was first proposed in 1734 by Emanuel Swedenborg.

  • Nebular Theory arrow_upward


  • Our Solar system was formed 4 billion years ago when a small part of a giant molecular cloud experienced a gravitational collapse.
  • Most of the collapsing mass collected in the center forming the Sun while the rest flattened into a protoplanetary disk, out of which the planets, moons, asteroids, and other small Solar System bodies formed.
  • Nebula: Cloud of interstellar dust and gas.


  • Thank You from Kimavi arrow_upward


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