The Solar System

• What is the Sun?

  • A star
• What galaxy is the Sun in?

  • The Milky Way Galaxy
• What else, other than the eight planets, orbit the sun?

  • Dwarf planet
• The Eight Planets

  CLOSEST TO FURTHEST FROM THE SUN:

  1. Mercury
  2. Venus
  3. Earth
  4. Mars
  5. Jupiter
  6. Saturn
  7. Uranus
  8. Neptune
• Brief description : How was the sun formed?

  • From a cloud of dust and gas called a nebula
  • Pulled together by gravitational attraction
• What is a Nebula?

  • Cloud of dust and gas
• How does the nebula being pulled together cause a fusion reaction?

  • Joining of two lighter atomic nuclei (hydrogen) to form a larger, (helium) one
  • Process releases energy
• What are natural satellites?

  • Moons that orbit the planets
  • Circular orbit
• Fusion reaction and equilibrium

  • Lead to an equilibrium between the gravitational collapse of a star and the expansion of a star due to fusion energy.
  • Where the forces are balanced.
• Describe the orbit of an artificial satellite

  • Circular
• Alternative word for circular

  • Elliptical
• Give two way that the historical model of the solar system shown in the figure above is different from what we now know about the solar system.

  • The Earth is at the centre not the sun
  • There are fewer planets
• Give one way that the solar system shown in the figure above is the same as what we now know about the solar system.

  • Planets have circular orbits
  • Moon in orbit around the Earth
• What 4 things does the Solar System contain?

  • 8 planets
  • Dwarf planets (e.g pluto)
  • The Sun
  • Natural satellites (the moons)
• Acronym 


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