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Q&A Define criteria for a planet viability scale

It has been a really long trip since we left our home planet. We have seen so many stellar systems but no planet was over 5 on our Viabilometer©... I was desperate until today ! My Viabilometer...

3 answers  ·  posted 7y ago by EngelOfChipolata‭  ·  last activity 7y ago by EngelOfChipolata‭

Question planets evolution