At Space Launch Complex 2 on North Vandenberg Air Force Base, Calif., the Aura spacecraft is lifted up the mobile service tower, or gantry. The latest in the Earth Observing System (EOS) series, Aura is scheduled to launch July 10 aboard the Boeing Delta II rocket. Aura’s four state-of-the-art instruments will study the dynamics of chemistry occurring in the atmosphere. The spacecraft will provide data to help scientists better understand the Earth’s ozone, air quality and climate change.