You start it then Anton. Hope you keep returning here as you are my only regular since @nebbit and @
Dani8 abandoned it.
There's no scientific evidence yet, not even something close.
The closest I know, so far, is the possible existence of a relatively large body of liquid water, 1.5 km beneath Mars's surface (near its South pole):
https://www.bbc.co.uk/news/science-environment-44952710
(July 25, 2018)
"What does this mean for life?"
- Nothing definitive. Yet."
Dr Manish Patel from the Open University explained:
"We have long since known that the surface of Mars is inhospitable to life as we know it, so the search for life on Mars is now in the subsurface.
"This is where we get sufficient protection from harmful radiation, and the pressure and temperature rise to more favourable levels. Most importantly, this allows liquid water, essential for life [as we know it]."
This principle of following the water is key to astrobiology - the study of potential life beyond Earth.
So while the findings suggest water is present, they don't confirm anything further.
"We are not closer to actually detecting life," Dr Patel told BBC News, "but what this finding does is give us the location of where to look on Mars. It is like a treasure map - except in this case, there will be lots of 'X's marking the spots."
When something truly exciting regarding non-earthly life is scientifically revealed, I'll think about starting a thread based on that piece of news and its implications. I think we won't have to wait for too long.