stillnotelf t1_izw20mg wrote
Reply to comment by AutoModerator in [WP]Two planets are in such close (yet stable) orbit that about once a century the inhabitants and even some animals are able to move from one planet to the other with relative ease. by HardcoreMandolinist
I've read this as a moderately hard sci fi novel. One was a desert, one an ocean. The desert had all these weird slightly soft rocks that didn't fit geologically, think glacial boulders. Turned out they were eggs from when the water switched sides every so often
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