Is that a rainbow on Mars? Nasa explains photo clicked by Perseverance rover The latest photograph shared by Perseverance got netizens discussing various theories on Reddit and Twitter on how a rainbow is next to impossible on Mars. But there it was. advertisement UPDATED: April 7, 2021 12:08 IST The photo clicked by Perseverance rover that got everyone talking about a 'rainbow on Mars'. (Image: NASA/JPL-Caltech) A few days back when Nasa's Perseverance rover shared an image of the horizon of the Martian surface, it triggered an online debate. But the discussion was not about the Martian land or its contents. It was about a supposed rainbow on the yellow sky over Mars.