Gravi-2 experiment flown on the International Space Station. Gravi-2 continues the research of its predecessor into how sensitive plants are to gravity.
To find out, 768 lentil seeds were subjected to different levels of simulated gravity. Spinning them in centrifuges at different speeds on the Space Station recreated gravity, similar to how astronauts and fighter pilots are subjected to high g-forces in human centrifuges.
The goal is to see at what gravity level the seedlings begin to show growth differences. Kept spinning for 30 hours at four different centrifuge speeds, the seedlings were observed as they grew.