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____ has almost no atmosphere. Mars has a very thin one.
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1. Mercury
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Uranus and ____ appear blue due to methane in their atmospheres.
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2. Venus
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Titan is the largest of the 146 known moons orbiting ____.
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3. Earth
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Galileo observed the four largest moons of ____ in 1610.
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4. Mars
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____ was the first planet discovered using a telescope (1781).
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5. Jupiter
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____ has a huge dormant volcano named Olympus Mons.
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6. Saturn
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Due to its thick CO2 atmosphere, ____ is the hottest planet.
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7. Uranus
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____ is one astronomical unit (93 million miles) from the Sun.
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8. Neptune
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