NASA's Super Guppy aircraft—the airplane that carries the space agency's biggest loads—sits overnight at NASA Langley Research Center in Hampton, Virginia for a well-deserved break.

In fact, it had carried the fuselage of... another aircraft, due to be tested at the center. The Guppy had shipped a "representative test article of a futuristic hybrid wing body aircraft...," according to NASA. "The large test article, representing the uniquely shaped fuselage cross-section, is made out of a low-weight, damage-tolerant, stitched composite structural concept called Pultruded Rod Stitched Efficient Unitized Structure, or PRSEUS." [NASA]