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| The Sun burns hydrogen in a process called nuclear ________________. |
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| __________________ form as the material in the disc around a pre-existing star begins to condense around a rocky or icy core. |
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| The Sun's diameter is ________________ times bigger than the Earth's. |
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What, other than planets reflect starlight in the nighttime sky?
Hint: We talked about 3 in class! |
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| ________________ is the smallest planet in our solar system. |
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| ____________________ is the largest planet in our solar system. |
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| __________________ is the oldest planet in our solar system. |
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| ___________________ is the outermost planet in our solar system. |
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| Mercury is 0.5 AU from the sun. How many miles is that? |
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| What does the unit AU stand for? |
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| How long does it take light to get from the Sun to the Earth? |
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| This is the distance (in miles) between the Sun and the Earth. |
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| How far is Mars from Earth, at its closest point? |
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| With current technology, how many days would a trip to Mars take (1 way)? |
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| rocky or terrestrial; gas giants or jovial |
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| The four inner planets are the ____________________ planets, while the 4 outer planets are the _________________. |
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| What percentage of the solar system's mass is in the Sun? |
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_______________________ is the pulling force that keeps objects in circular, or elliptical paths.
Hint: Not gravity; more specific |
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| B. Planets revolve around the sun in all different directions. |
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Definition
Which of the following is NOT TRUE about the planetary orbits in our solar system?
A. Orbits are all on an almost flat plane.
B. Planets revolve around the Sun in different directions.
C. Most planets rotate counterclockwise. |
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| This force is what makes planets and stars round. |
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| Inner planets rocky; outer planets gaseous |
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| What evidence do we have that the solar system formed from a huge cloud of different gases and dust specks? |
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| The planets orbit the sun on the same plane |
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| What evidence do we have that the cloud of gas and dust that the solar system formed from was flat? |
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| All planets revolve around the sun in a counter-clockwise direction; they also rotate (most) in a counter-clockwise direction. |
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| What evidence do we have that the cloud of gas and dust that the solar system formed from was spinning? |
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Rotation= spinning on axis= day and night
Revolution= orbit around sun= years and seasons |
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| What is the difference between Earth's rotation and its revolution? |
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| This planet does not rotate like the others, it turns in a clockwise direction. |
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| This planet rotates on its side, in a rolling motion. |
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