Perseverance detects buried ancient river delta in Jezero — some of the oldest evidence of flowing water on Mars

Using ground-penetrating radar in Jezero Crater, NASA's Perseverance rover has detected a buried ancient river delta that predates surface deposits seen from orbit. The discovery provides some of the oldest direct evidence that liquid water flowed on Mars billions of years ago and reveals deeper fluvial architecture for future sampling.

Discovered 2026-03-18T11:04:49.449373-07:00 | 2026-03-18T11:04:49.449373-07:00

Briefing

What Hype is tracking

  • Extends the stratigraphic record in Jezero with buried fluvial deposits, informing where Perseverance should collect samples and complementing earlier in situ detections of lake and beach deposits [source:12d5b607-3170-45a2-aa92-aab892ee5773]
  • Uses ground-penetrating radar to reveal subsurface targets invisible from orbit, validating subsurface mapping techniques tied to Perseverance's improved autonomy and localization [source:2dc531d8-7ff1-40a0-986c-996b8363ab22]
  • Adds a deeper line of evidence for a warmer, wetter early Mars: buried deltas older than surface deposits bolster other findings of prolonged aqueous alteration and help refine where biosignatures may be preserved [source:01221d85-68a7-4976-b20f-fd41f9a7e44e]

Reported By

Times of India Ars Technica fr.de thedebrief.org heise.de Reuters
Sources Tracked
8
First Seen
2026-03-18T11:04:49.449373-07:00
Latest Update
2026-03-22T03:50:35.302408-07:00
Coverage
Space

Sources

Hype groups these reports into one evolving story so you can compare coverage without losing the thread.

Related Coverage