2,028 likes, 32 comments - nasajohnson on January 27, 2026: "CHAPEA hits the 100-day mark! 🎉 The crew of NASA’s year-long Mars simulation has been working hard to help us learn how long-duration space missions affect crew health & performance. Swipe through some photos of daily life, science tasks, and more from the past 3 months! ➡️ Image 1: Crew Health and Performance Exploration Analog (CHAPEA) Mission 2 crew. (from left: Ross Elder, Ellen Ellis, Matthew Montgomery, James Spicer) Credit: NASA/CHAPEA Image 2: Crew Health and Performance Exploration Analog (CHAPEA) Mission 2 Science Officer, Matthew Montgomery and CHAPEA Mission 2 Commander, Ross Elder in the airlock ready to go on an EVA. Credit: NASA/CHAPEA Image 3: Crew Health and Performance Exploration Analog (CHAPEA) mission 2 science officer, Matthew Montgomery, evaluating a science experiment involving seed germination in the glovebox. Credit: NASA/CHAPEA Image 4: Crew Health and Performance Exploration Analog (CHAPEA) Mission 2 medical officer, Ellen Ellis, exercising in the habitat using a stationary bike. Credit: CHAPEA/NASA Image 5: Crew Health and Performance Exploration Analog (CHAPEA) Mission 2 flight engineer, James Spicer, working on a science task involving seed germination. Credit: NASA/CHAPEA".