30. Footprints on the Moon are not
erased because there is no wind there. If there is no wind, how did the American flag
wave? It actually didn't fluctuate! That ripple motion you see is actually due to weak gravity.
While the astronauts were flying the flag on the lunar surface, he slanted the flagpole into
the lunar soil so that it could go deeper, and the flag, which started to move to regain
its equilibrium position due to the tilt, fluttered for a slower time compared to the one
on Ea
rth when the gravitational force was weak.
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