Former NASA astronaut Mike Massimino joins ‘America’s Newsroom.’ NASA has debunked speculation over an image from Mars that appeared to show what many believed to be a "rainbow" or "dustbow." In a Tuesday tweet, the NASA Perseverance Mars rover account wrote that the agency had seen comments online wondering about the bright arc captured in the April 4 photo from the rover's onboard Rear Left Hazard Avoidance Camera. "Many have asked: Is that a rainbow on Mars?" they said. "No. Rainbows aren't possible here." "Rainbows are created by light reflected off of round water droplets, but there isn't enough water here to condense, and it’s too cold for liquid water in the atmosphere," they continued. "This arc is a lens flare."