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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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