Cargo bay with space plane

This artist's rendering, also from a decade ago, gives a sense of the X-37B's size relative to that of the space shuttle. NASA said at the time that two X-37 vehicles could fit in the cargo bay of a shuttle. (The cargo bay of the X-37B, meanwhile, is roughly the size of a pickup truck bed.)

Here's the tale of the tape for the X-37B: It's 29 feet, 3 inches long, stands 9 feet, 6 inches high, and has a wing span of just under 15 feet. Its weight at launch: 11,000 pounds.