What are UFOs if they're NOT alien spacecraft?

[John_DiFool]

Quasi-off-topic, but so far nobody has bothered to start a new thread here, which surprises me.

Anyway, Perseverance found a weird rock on Mars which appears to contain similar features to Terran rocks which once were part of a floodplain:

NASA’s Perseverance Rover Scientists Find Intriguing Mars Rock - NASA