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Q&A How can a portal that connects two planets affect the environment?

In my world there are two planets within the same solar system, which are connected approximately every seven cycles through a portal that opens for a few days. The planets are very similar. The ...

11 answers  ·  posted 6y ago by Hedufigo‭  ·  last activity 6y ago by Hedufigo‭

Question environment earth-like biology planets earth