Martian Meteorite Reveals Ancient Atmospheric Chemistry (image) University of Maryland Share Print E-Mail Caption A microscope reveals colorful augite crystals in this 1.3 billion year old Martian meteorite, MIL 03346. To help reconstruct Mars' ancient atmosphere, researchers analyzed sulfur isotopic ratios in 40 martian meteorites. Credit James Day Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.