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All answers having "Sky sight?" as clue:

3 Character Answers:

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PIE

SOL

SUN

UFO



4 Character Answers:

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MARS

MOON



5 Character Answers:

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CIRRI

CLOUD

COMET



6 Character Answers:

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AURORA

METEOR

NEBULA



8 Character Answers:

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MOONRISE



10 Character Answers:

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LITTLEBEAR