Harcourt Science

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Solar System

• Harcourt Science
• Unit D
• Chapter 3

Mrs. Strand Lockwood Middle School
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Chapter Project
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Solar System

• Terms to know
• Planetary system
• Asteroid
• Meteoroid
• Comet
• Astronomical unit
• Light year

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Organization of the Solar System

• There have been various models over time.
• There are two basic theories
• Geocentric
• Heliocentric
• There are two basic orbital patterns
• Elliptical
• Circular

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Structure of the Solar System

• Sun
• Planets
• Moons
• Asteroids
• Meteoroids
• Meteors
• Meteorites
• Comets
• What is the difference between a planet and a
  moon?

http//images.google.com/imgres?imgurlhttp//www.
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Astronomical Units and Light-Years

• 93,000,000 miles or 150,000,000 KM distance from
  sun to earth 1 AU Usually used to measure
  distances between planets

Light years usually used To measure distance
to stars
5,900,000, 000 miles or 9,500,000,000 KM
distance from the sun to the nearest star
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Cycles of Planets

• Terms to know
• Rotation
• Axis
• Revolution
• Orbit
• Ellipse

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Planets rotate on their axis

• Each day, 24 hours on Earth, is one rotation.
• Each year, 365 1/4 days on Earth is one
  revolution.

http//csep10.phys.utk.edu/astr161/lect/solarsys/r
evolution.html
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Orbits

• Elliptical
• Perihelion
• Aphelion
• How planets move in their orbits
• Property of inertia

http//www.yourdictionary.com/images/ahd/jpg/A4per
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http//www.space.com/bestimg/?guid4499b3949c8dbc
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Wobbly planets

• Precession of the Earth
• How do we even know this happens?
• The North star changes from time to time.
• See chart pg D90

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Why do planets have seasons?

• Terms to know
• Season
• Axial tilt

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Earth Seasons

• Are we pointing towards the sun or away from it?
• Autumnal Equinox Dates?
• Winter Solstice Dates?
• Vernal Equinox Dates?
• Summer Solstice Dates?

Hmmmmm How does the tilt of the earth affect
temperature?
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What
Still looking to the stars for answers?
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Why are seasons on Mars so much more extreme?
Do you think there are planets with
NO seasons? Why or why not?

• Angle of axis
• Shape of orbit

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Phases of the moon

• Terms to know
• Phases
• First quarter
• Third quarter
• Waning
• Waxing

http//images.google.com/imgres?imgurlhttp//www.
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Phases of the moon
Have you ever wondered why the moon
appears larger in the early evening, than later
at night?
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http//radiojove.gsfc.nasa.gov/images/phases_of_mo
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