“Complex organic molecules such as amino acids, the building blocks of life, are routinely found in space.
“But it’s further tantalising evidence that life could have existed on Mars, and still could.
“Nobody is claiming this is the discovery of life, note, but it’s nonetheless interesting in the context of the search for past or present life on Mars.”
Organic compounds such as carbon, hydrogen, nitrogen and oxygen are created all throughout the universe without any biological involvement.
The “tough” organic molecules were drilled out by Curiosity from three billion-year-old sedimentary rocks near the planet’s dusty surface.