Mars Organic Discoveries: Perseverance Biosignature & Curiosity Complex Organics
Key Questions
What biosignature evidence did Perseverance find at Bright Angel Trail?
Perseverance's SHERLOC instrument detected organic molecules with carbon bonded to hydrogen and oxygen in an ancient riverbed, plus reduction spots resembling bacterial signatures on Earth. A sample was collected for future return to Earth.
What complex organics were discovered by Curiosity in Martian clay?
Curiosity identified 21 organic molecules in a 3.5-billion-year-old clay rock, including seven never before seen on Mars such as a nitrogen heterocycle, confirming that complex carbon chemistry can persist for billions of years.
How do these Mars discoveries advance the search for past life?
Both Perseverance and Curiosity findings provide the strongest evidence yet for past Martian life through organic biosignatures and support the Mars Sample Return campaign for detailed Earth-based analysis.
Perseverance rover found organic molecules in an ancient riverbed at Bright Angel Trail—SHERLOC detected carbon bonded with H and O, alongside reduction spots that on Earth are bacterial signatures. A sample has been collected for future Earth return. This is the strongest evidence yet for past Martian life. Separately, Curiosity rover detected 21 organic molecules in a 3.5-billion-year-old clay rock, including seven never seen before on Mars (e.g., nitrogen heterocycle), confirming complex carbon chemistry can survive for billions of years. Both findings advance the search for biosignatures and the Mars Sample Return campaign.