The Perseverance rover's discovery of a potential biosignature found on a sedimentary rock on Mars is an exciting development in our search for life elsewhere in the universe, but how does it rank compared to other potential biosignatures that have previously been discovered on the Red Planet — and even beyond?
"It's arguably the best evidence that we have so far for microbial life on early Mars," Oleg Abramov of the Planetary Science Institute told Space.com.
