What is a similar spiral galaxy?
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What are star clusters?
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In what place is the Earth located on the galaxy?
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What is the Milky Way?
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What is a galaxy?
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What is an antimatter?
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What is called the smallest particle?
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What element was formed first?
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What does everything hold on?
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What are particles?
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What made the universe?
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How did iron form?
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How did the atoms form?
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What is a black hole?
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How many black holes exist?
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What is the size of a black hole?
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What's going on inside a black hole?
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How do astronomers measure distances?
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What is the distance to the dawn?
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What is the distance from the earth to the sun?
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How did you measure the distance to the Sun for the first time?
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Are the stars gone?
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The moon is our neighbor
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What is a red shift?
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What is a parsec?
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