NASA officials sent over 2,000 baby jellyfish into space. Tens of thousands more came back to Earth | Discover Wildlife
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Scientists wanted to find out whether humans born in space still retained their sense of gravity. So they turned to baby jellyfish

The jellyfish were launched on the rocket STS-40, in the Space Life Science-1 (SLS-1) on June 5th 1991. The experiment was led by a researcher named Dorothy Spangenberg and lasted nine days. One of the purposes of this mission was to investigate the consequences of the body’s adaptation to microgravity and readjustment to Earth’s gravity.