Moon quiz
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How long does moonlight take to reach Earth?
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More questions about Moon
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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What are the Moon's dark patches made of?
Answer: Hardened lava
Why: Early astronomers took them for seas, which is why they are still called maria, Latin for 'seas'.
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How much brighter is a full Moon than a half Moon?
Answer: About 10 times
Why: With the Sun right behind us at full Moon, the shadows of rocks and grains hide from view, causing a brightening called the opposition surge.
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How fast is the Moon drifting away from Earth?
Answer: 3.8 cm a year
Why: Scientists measure it by timing laser pulses bounced off mirrors that Apollo astronauts left on the Moon.
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What color does the Moon turn in a total lunar eclipse?
Answer: Red
Why: Earth's air strips out blue light and bends the red into its shadow, so the Moon glows with every sunrise and sunset at once.
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Where does the Moon rank in size among the Solar System's moons?
Answer: Fifth
Why: Compared with the size of its planet, though, it is the biggest moon of any planet in the Solar System.
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Which Mars-sized planet likely hit Earth and formed the Moon?
Answer: Theia
Why: Theia is named after the Greek Titan who was the mother of Selene, the goddess of the Moon.
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