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Who is Dr. Astrid?

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The secret word is AEROSPACE.

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The maze in the book spells ENDEAVOR

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The city with the most sightings is TISDALE

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The last planet standing is MERCURY

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After sequencing the letters you get SUPERNOVA

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The secret word is GALILEO.

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The constellation is CYGNUS

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After cutting out the moon and folding it correctly you can identify it as CHARON.

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The game is called INVADERS

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The star is POLARIS

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The safe's code is 999

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Plug in the letters from each colored sun into the safe