Perseverance's potential biosignature sample raises stakes as China's Tianwen‑3 aims to return Mars material
Perseverance's recent analysis of Jezero's 'Sapphire Canyon' mudstones finds organics plus iron‑phosphate and iron‑sulfide nodules that resemble microbial textures, but definitive identification requires Earth laboratory study. China’s Tianwen‑3 sample‑return campaign could be the first mission to deliver Martian material to Earth for that analysis.
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