Outer Space quiz
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Which planet orbits closest to the Sun?
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More questions about Outer Space
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Which protoplanet collided with Earth to form the Moon?
Answer: Theia
Why: The colliding body Theia was roughly the size of Mars when it struck the young Earth.
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What icy body grows a glowing tail near the Sun?
Answer: Comet
Why: A comet's tail always points away from the Sun because the solar wind pushes vaporized gas and dust outward.
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What shift to longer wavelengths shows galaxies are receding?
Answer: Redshift
Why: Edwin Hubble used galaxy redshift to demonstrate that the universe itself is continuously expanding.
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What gives Mars its red color?
Answer: Iron oxide
Why: Iron minerals in Martian surface rocks rusted over billions of years, coating the landscape in red dust.
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What does a light-year measure?
Answer: Distance
Why: Despite having the word year in its name, a light-year measures the physical distance light travels rather than time.
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How many natural moons orbit Earth?
Answer: 1
Why: Earth has only one moon, unlike neighboring Mars with two and Venus and Mercury with none.
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