AdventureX 3

Code for last room:
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Submitted by: RM

Imagine a keypad (first row 123, second 456 and third 789), so
the first serie of signs goes like 482937516. Than order the 
planets (correct signs, except for earth i guess) by decreasing
size: the order would be (from left to right) 674329185. 
Than match that positions with the first signs and you’ll get the 
code 759286413. And you’re out.