The Space.com article Space Station Crew Returns to Earth Tonight: Watch It Live leads with a photo of three astronauts on the ISS that are backlit with bright green light, which can also be seen spilling out onto the walls in various patterns.
Neither the article nor the photo caption (shown below) mention it or explain the origin or purpose of this bright green lighting, but there must be some reason for it. Is this explained elsewhere?
below: "NASA astronaut Peggy Whitson, Russian cosmonaut Fyodor Yurchikhin and NASA astronaut Jack Fischer float through the Harmony module of the International Space Station. All three will return to Earth on Sept. 2, 2017." Credit: NASA, from Space.com.