The Roll Out Solar Array (ROSA) is incredibly lightweight and flexible, meaning that it can easily be packed into a rocket for launch. ROSA is a collaboration between NASA's Space Technology Mission Directorate and two private companies, including Deployable Space Systems (DSS) of Santa Barbara, California, and Space Systems Loral (SSL) of Palo Alto, California.

ROSA is designed to power missions using solar-electric propulsion spacecraft. The solar array wing technology is expected save on storage space and cut costs for long-distance trips beyond Earth, according to a statement from NASA.

This past weekend, engineers on the ground remotely rolled out the solar array using the space station's Canadarm2. The array will remain attached to the robotic arm for seven days. This experiment will test the overall effectiveness of the advanced solar wing. ROSA was delivered to the orbiting lab on June 5 aboard the SpaceX Dragon cargo ship. 

"We want to show that we can pull the wing back in in a predictable way," Jeremy Banik, the experiment's principal investigator and a senior research engineer at the Air Force Research Laboratory in New Mexico, said in a statement. "A practical reason is that we have to pull it back for stowage after this investigation, but it will be good to know it can be done for future applications, potentially for a highly maneuverable spacecraft."