China's in-orbit Shenzhou-16 astronauts showed how the water surface reacts to being hit with a table tennis ball during the fourth lecture of the Tiangong Class livestreamed on September 21.
The Tiangong Class is a series of space science lectures that aim to inspire the youth curious about space. Three previous lectures were carried out by China's Shenzhou-13 and Shenzhou-14 crews.
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