New Delhi, Oct. 14 -- The answer to the International Space Station's aging power system left Earth on Tuesday folded inside the unpressurized trunk of a cargo Dragon: the final two roll-out solar arrays NASA plans to install, weighing 2,635 pounds on the ground.

33 a.m. EDT from Space Launch Complex 40, and its first stage landed near the pad at 6:41 a.m. after two sonic booms, CBS News reported. Dragon is due to dock autonomously at the Harmony module's space-facing port at 11 a.m. Thursday, NASA said.

The arrays matter because the station's original eight solar wings are wearing out. The new blankets, known as IROSA, are mounted on top of the old wings rather than replacing them. Dana Weigel, director of low-Earth orbit operations at...