In 2003, Nasa researchers found freshwater snails mated and reproduced in space, with gravity-sensing statoconia 50% larger by volume than ground controls

Nasa researchers observed freshwater snails reproducing in space during a Shuttle mission. Their gravity-sensing organs, called statoconia, grew substantially larger in microgravity. Swordtail fish larvae also developed enlarged otoliths, which are similar gravity-sensing stones. This indicated a critical developmental period where altered gravity impacts stone size. The findings suggest these organs regulate to achieve a functional weight.
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