AIM

AIM, U.S. satellite designed to study noctilucent clouds. AIM was launched on April 25, 2007, by a Pegasus XL rocket that was dropped from an airplane. Noctilucent clouds are faint ice-bearing clouds that form at a height of about 80 km (50 miles) in the layer of the atmosphere called the mesosphere. These clouds were first seen in 1885 and have grown brighter since then. AIM carries experiments designed to study ice particles, chemicals, and...