This aerial view of Launch Complex 39 shows a new mobile launcher or ML for the Constellation Program.

At NASA's Kennedy Space Center in Florida, this aerial view of Launch Complex 39 shows a new mobile launcher, or ML, for the Constellation Program, at far right, being constructed in the mobile launcher park site area north of the 525-foot-tall Vehicle Assembly Building. In the background is the Indian River.

When completed, the tower will be approximately 345 feet tall and have multiple platforms for personnel access. Its base is being made lighter than space shuttle mobile launcher platforms so the crawler-transporter can pick up the heavier load of the tower and a taller rocket. For information on the Constellation Program, visit http://www.nasa.gov/constellation. Photo credit: NASA/Cory Huston