The Falcon feather on the moon
From Atlas Obscura:
When astronauts go to the moon, they tend to litter. Besides the generic debris—spent bits of spacecraft; empty food bags; full vomit bags—other, more distinctive remnants of each Apollo mission remain. The two golf balls hit by Apollo 14’s Alan Shepard in February 1971 still lie on the lunar surface, as does a family portrait that astronaut Charles Duke left there during the Apollo 16 mission in April 1972.
Then there is an even more delicate object: a falcon feather, dropped during the Apollo 15 mission and left there ever since.
Click here for the full article on why astronauts brought a feather to the moon.