Did life once exist on Mars? NASA believe that spots found on Mars rocks could be proof of microbes having once lived on the red planet.
'Leopard spots' found on rock on Mars are clearest sign life once existed on red planet, NASA says.
The space agency said analysis of the unusual markings by the Perseverance rover has revealed they contain minerals that on Earth can be a byproduct of microbes. Scientists can't rule out that the spots were caused by natural geological processes.
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'Leopard spots' found on rock on Mars are clearest sign life once existed on red planet, NASA says.
The space agency said analysis of the unusual markings by the Perseverance rover has revealed they contain minerals that on Earth can be a byproduct of microbes. Scientists can't rule out that the spots were caused by natural geological processes.
Source and further reading:

'Leopard spots' found on rock on Mars are clearest sign life once existed on red planet, NASA says
The space agency said analysis of the unusual markings by the Perseverance rover has revealed they contain minerals that on Earth can be a byproduct of microbes. Scientists can't rule out that the spots were caused by natural geological processes.