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Galileo observed the four largest moons of ____ in 1610.
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1. Mercury
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Due to its thick CO2 atmosphere, ____ is the hottest planet.
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2. Venus
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____ and Neptune are about four times larger than the Earth.
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3. Earth
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____ radiates more heat than it receives from the Sun.
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4. Mars
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____ has extreme temperatures (800°F day vs -330°F night).
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5. Jupiter
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____ has two small moons named Phobos and Deimos.
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6. Saturn
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____ has an atmosphere of 78% nitrogen and 21% oxygen.
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7. Uranus
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Titan is the largest of the 285 known moons orbiting ____.
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8. Neptune
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