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herbw t1_jbawpal wrote on March 7, 2023 at 6:58 PM

Reply to comment by EmperorKira in TIL the largest moon in our solar system, Ganymede, is larger than the planet of Mercury by Jugales

Three if we count the vast and deep oceans. And then our thick atmosphere, where birds live, esp. Swallows, and many birds while migrating, too. 4 major layers is very complex system. Just right for life.