The Solar System
December 13, 2010
Objectives
• TODAY I WILL BE ABLE TO:
– Differentiate between the _________and
_________________of the earth.
– Explain how the ___________in the earth’s axis
creates ____________________.
– Defend whether or not you agree with the ______
___________________________
Key Points
• The Big Bang Theory states that the Universe was
created in a ___________moment in time.
• The Big Bang is a ________, and there are other
theories that attempt to explain the origin of the
Universe.
• The earth’s ____________is the turning or
spinning of a body on its axis.
• The earth’s rotation is the movement responsible
for day and night.
• The earth’s tilted _________causes seasons.
• Earth’s movement, or orbit around the sun is
known as REVOLUTION.
ORIGIN OF MODERN
ASTRONOMY
• Astronomy is the science that studies the
______________________.
• ___________________
– Concluded that the earth was ___________
because it had a curved shadow.
• ______centric view – the ____________ was
the center of the universe
• Geocentric Model
– the Earth was a sphere that stayed motionless at
the center of the solar system. The sun, moon,
and known planets revolved around the Earth.
Supported by Aristotle, believed for 2000 years!
• _______centric Model
– the ___________was at the center of the
universe. The Earth and other planets orbit the
sun. Supported by Aristarchus.
• Copernicus concluded that Earth is a ________. The
sun is at the center of the solar system and the
planets orbit the sun. In the Copernican model, the
orbits of planets were perfect circles.
Motions of the Earth
• _______________– turning on axis, results in ______
______________ and defines the length of a day
– Noon to noon is 24 hours (solar day)
• _______________– __________________________,
defines the year, changes what constellations we can
see in the night sky
• _______________- Earth’s _______slowly but
continuously points in different _____________.
Earth’s _____________causes ________________
– June 21-22 Summer solstice
– March 20 or 21 or September 22-23 are the equinoxes
(equal length of day and night)
– December 21-22 Winter solstice
• The solar system is rotating in the arms of the Milky
Way _________________at 250 km/second
• The entire galaxy is also moving. The Milky Way
galaxy is moving toward Andromeda
Check Ins – Use complete sentences
1. Explain the Geocentric model of the Universe.
Explain the Heliocentric model of the Universe.
Which model do we know to be true?
2. “Earth’s axis slowly but continuously points in
different directions” – this describes which
movement of the earth?
3. Describe earth’s rotation and what it affects.
4. What movement of the earth creates seasons?
Origins of the Universe
• Throughout history there have been many
theories about how the universe formed.
• Today we are going to read about “The Big
Bang” theory.
• As you read, answer the questions on your
worksheet. This is due in 20 minutes.