Curiosity Maps Mars Climate Shift in 20 Samples, Tracing Warm Groundwater for 4.7 Million Years
Updated
Updated · Science@NASA · May 28
Curiosity Maps Mars Climate Shift in 20 Samples, Tracing Warm Groundwater for 4.7 Million Years
3 articles · Updated · Science@NASA · May 28
Twenty rock samples from Gale Crater showed hematite crystals changing with elevation, giving Curiosity a new mineral marker for when Mars shifted from wetter conditions toward a colder, drier climate.
CheMin data found hematite crystallites under 10 nanometers in higher layers but as large as 65 nanometers in deeper ones, where goethite had disappeared — a pattern tied to warmer, longer-lived water exposure.
The team concluded warm groundwater likely persisted in Gale Crater’s deepest layers for up to 4.7 million years, allowing crystal growth and potentially habitable subsurface conditions even as surface climate cooled.
Published in Science, the study relies on X-ray diffraction of drilled Martian rock rather than orbital modeling, showing Curiosity can extract crystal size, shape and related minerals directly from samples.
Now that life's building blocks are confirmed on Mars, what evidence would finally prove ancient organisms existed there?
Could hidden oases of warm water still exist deep underground on Mars, potentially harboring life today?
Warm Groundwater Activity in Gale Crater Reveals Extended Martian Habitability and New Targets for Life Search
Overview
NASA's Curiosity rover has revealed strong evidence that ancient groundwater persisted beneath Mars's surface in Gale Crater, even after the planet became cold and dry. Over six months, Curiosity explored unique geologic ridges and hollows formed by groundwater seeping through cracks in the crust. By analyzing iron oxide hematite crystals found in these formations, scientists identified mineral markers that record changes in Mars’s ancient climate. These discoveries deepen our understanding of Mars’s subsurface environment and suggest that underground water may have lasted much longer than previously thought, offering new hope in the search for past life on Mars.