"He has alluded to the concept of panspermia, the idea that Mars and Earth have exchanged material or even life in the past due to asteroid impacts anyway."
As far as I'm aware the existence of material on Earth from Mars is an accepted fact albeit not proof of or synonymous with panspermia.
The following article says it's been pretty well confirmed since 2013 that meteorites thought to come from Mars really did.
As far as I'm aware the existence of material on Earth from Mars is an accepted fact albeit not proof of or synonymous with panspermia.
The following article says it's been pretty well confirmed since 2013 that meteorites thought to come from Mars really did.
https://en.wikipedia.org/wiki/Martian_meteorite