Exoplanets quiz
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Which Star Wars world has two suns, like Kepler-16b?
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More questions about Exoplanets
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Why are exoplanets so hard to photograph?
Answer: Their star's glare
Why: In reflected light, a Sun-like star outshines an Earth-like planet about 10 billion times.
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What space telescope found more than 2,600 planets?
Answer: Kepler
Why: Kepler first stared nonstop at about 150,000 stars in one patch of sky in Cygnus, watching for tiny dips in their light.
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What kind of star did the first confirmed exoplanets orbit?
Answer: A pulsar
Why: They were found because tiny, regular shifts in the timing of the pulsar's radio pulses betrayed their tugs.
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What nickname does a star's habitable zone have?
Answer: Goldilocks zone
Why: Like the porridge in the fairy tale, it is just right: neither too hot nor too cold for liquid water on a planet's surface.
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How many Earth-sized planets orbit the star TRAPPIST-1?
Answer: Seven
Why: All seven circle their small, cool star closer than Mercury orbits the Sun.
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About how much would Earth's transit dim the Sun for distant viewers?
Answer: About 0.01%
Why: A Jupiter-sized planet blocks about 1% of the Sun's light, over 100 times more than Earth does.
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