An Orbital Sciences-built Pegasus XL rocket carrying NASA's AIM satellite drops from its Stargazer L-1011 parent aircraft (left) and launches spaceward (right)on April 25, 2007. The AIM - or Aeronomy of Ice in the Mesosphere - satellite is designed to study noctilucent clouds, which hover on the edge of space and are only visible at night. Credit: NASA TV.
