I. Early Astronomy In Aristotle’s geocentric model, what is at the center of the solar system?

Name _____________________________

Formation Of The Solar System (p. 671 – 679)
I. Early Astronomy
1. In Aristotle’s geocentric model, what is at the center of the solar system?
_______________________
2. How did Ptolemy’s model differ from earlier Greek models?
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3. Who developed the heliocentric model? ________________________________________
4. What did Isaac Newton believe was the attractive force of all universal objects?
_______________________
5. Match the following astronomers with their accomplishments. (Not in the book.)
1. ________ Nicolaus Copernicus A. Observed planet positions for 20 yrs; Supernova (1572)
2. ________ Tyco Brahe B. Used telescope to support heliocentric model
3. ________ Galileo Galilei C. Discovered the orbits of planets to be ellipses
4. ________ Johannes Kepler D. Developed the heliocentric model of the solar system
II. The Nebular Hypothesis
1. Complete the flowchart showing the sequences of the nebular hypothesis.
_________________________ years ago the solar system was a nebula

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The cloud fragments ____________________ into a large, tightly packed, spinning disk.

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Nuclear fusion begins, and the ____________ was born.

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The rest of the material in the disk cooled and __________________ into scattered solids.

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Planetesimals further collided and became the eight ________________________.
III. Rocks In Space
1. Define the term comet.
Comet –

2. What are the compositions of the two tails of a comet?
________________________________________________________________________
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3. Where are two origins of comets in the solar system?
1. ________________________________ 2. ________________________________
4. Match the following terms with the correct definitions.
1. ________ Meteoroid A. A meteoroid that has struck the Earth’s surface.
2. ________ Meteor B. A chunk of rock or dust in space.
3. ________ Meteorite C. A meteoroid that burns up in Earth’s atmosphere.
5. Where do meteoroids originate? _______________________________________________
6. What is the name of the meteorite crater impact in Winslow, Arizona that was created

50,000 years ago? _____________________________ _______________________
7. What is the significance of each of the following? (Not in the book.)
Tunguska Event : _________________________________________________________
Allende Meteorite : _______________________________________________________
Chicxulub Crater : ________________________________________________________
IV. How The Moon Formed
1. What are criticisms of the following theories concerning the formation of the Moon.
Capture Theory : _________________________________________________________
Co-Accretion Theory : _____________________________________________________
2. Complete the flowchart to show the sequence of events of the Impact Theory.
A large object, the size of ______________ collided with Earth about 4.4 billion years ago.

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Material from both objects were _____________________ into space.

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A ______________ of gas and debris formed around the Earth.

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Gravity caused this material to form the __________________.

V. Do Other Stars Have Planets?
1. Define the term exoplanet.
Exoplanet –

2. At least how many exoplanets have been discovered? _________________
3. What are the sizes of most known exoplanets?
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