The martian atmosphere is currently 200 times thinner than that of Earth. A 3 billion-year-old sandstorm recorded in the rocks could be the first direct evidence that wasn't always so. My latest for @science.org.🧪⚒️ 🚀🪐
Relics of an ancient sandstorm on Mars point to Earth-like windsCuriosity rover finds what may be the first direct evidence that Mars once had a thick atmospherewww.science.org