Red Planet’s interior may not churn much

Composition of 2.4-billion-year-old Martian meteorite matches that of younger ones

Mars’ volcano-filled Tharsis region

RED-HOT PLANET  A meteorite that probably originated from Mars’ volcano-filled Tharsis region (warmer colors denote higher elevations in this topographic map) suggests that a source of volcano-fueling magma inside the planet remained largely unchanged for billions of years.

NASA, JPL-Caltech, Arizona State University

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