Prebiotic chemistry is the chemistry that precedes life — the inorganic and organic reactions that produce the building blocks (amino acids, nucleobases, lipids, sugars) and energy/catalysis substrates from which microbial metabolism could emerge.
In a Mars/astrobiology context, three ingredients dominate recent in-situ findings:
- Catalytic metals — especially nickel and iron, which on Earth catalyze reactions central to the oldest known microbial metabolisms (methanogens, hydrogenases). Nickel was reported at ~1.1 wt% in neretva-vallis iron sulfides in 2026 (see src-perseverance-neretva-nickel-rocks-2026-04).
- Reduced sulfur — supports redox chemistry; reported alongside nickel in the same Martian bedrock.
- Organic carbon — see organic-molecules-mars; the 2026 Curiosity TMAH experiment detected DNA-precursor-like nitrogen compounds and benzothiophene in Gale Crater clays (src-curiosity-mars-life-molecules-2026-04).
The co-occurrence of these three on early Mars is the strongest argument yet that the ancient Martian environment hosted the right substrates for prebiotic chemistry, though prebiotic chemistry alone is not a biosignature.