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| 1 | |
How do Mercury’s radius and mass compare with the Earth’s? |
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| 2 | |
Does Mercury have an atmosphere? Why or why not? |
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| 3 | |
What is the surface of Mercury like? |
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| 4 | |
What is peculiar about Mercury’s rotation? What causes this oddity? |
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| 5 | |
How does Venus compare with the Earth in mass and diameter? |
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| 6 | |
Can we see the surface of Venus? Why or why not? |
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| 7 | |
How do astronomers know what the surface of Venus is like? |
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| 8 | |
What is the dominant gas in Venus’s atmosphere? How do astronomers know this? |
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| 9 | |
What are the clouds of Venus made of? |
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| 10 | |
Why is Venus so hot? |
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| 11 | |
What sort of features are seen on Venus’s surface? Is the surface young or old? How do astronomers know these things? |
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| 12 | |
How does Mars compare with the Earth in mass and diameter? |
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| 13 | |
Describe some of the surface features seen on Mars. |
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| 14 | |
What is the Martian atmosphere like? |
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| 15 | |
What explanation(s) have been offered for why the atmospheres of the terrestrial planets are so different? |
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| 16 | |
What are the Martian polar caps composed of? |
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| 17 | |
What is the evidence that Mars once had running water on its surface? |
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| 18 | |
How do astronomers explain why the Earth’s atmosphere ended up with so little CO2, compared with that of Mars and Venus? |
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| 19 | |
What is the evidence that leads some scientists to believe life may have existed on Mars? |
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