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A rainbow of ancient rocks on Mars | Space photo of the day for Nov. 2, 2026
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This rainbow-hued rocky plain looks like the landscape of an alien world. And, it turns out, it is.
In this image, we can see an ancient, rocky hill on Mars. In the Red Planet's Southern Highlands, this alien terrain is chock-full of minerals, which we can see clearly defined in this color-enhanced view of the region.
This image was snapped by the HiRISE camera aboard NASA's Mars Reconnaissance Orbiter (MRO), which has been studying the planet's surface, atmosphere and climate since arriving in Martian orbit in March 2006.
But this isn't exactly what the surface of the planet would look like through our eyes; the image is color-enhanced. Why would scientists take a natural-color image and turn it rainbow? Doing so enhances the slight color differences in these rocks, allowing researchers to pick out the different minerals.
As pointed to above, enhancing colors in scientific images can be an incredibly useful tool for exploration.
For instance, in this image, the blue- and green-toned rocks could be full of minerals like pyroxenes and olivine, according to scientists analyzing the image. And they think that the yellow, orange and red patches may contain minerals formed by past interactions with liquid water.
By exploring the mineral content of rocks like this, researchers can peel back the layers of history within the Martian bedrock. The discovery of certain minerals, for example, can show that water flowed on Mars long ago, pointing to potentially habitable conditions.
So, as we can see, this striking rainbow image isn't just a beautiful landscape; it's also hiding serious clues to Mars' history.
Chelsea Gohd served as a Senior Writer for Space.com from 2018 to 2022 before returning in 2026, covering everything from climate change to planetary science and human spaceflight in both articles and on-camera in videos. With a M.S. in Biology, Chelsea has written and worked for institutions including NASA JPL, the American Museum of Natural History, Scientific American, Discover Magazine Blog, Astronomy Magazine, and Live Science. When not writing, editing or filming something space-y, Gohd is writing music and performing as Foxanne, even launching a song to space in 2021 with Inspiration4. You can follow her online @chelsea.gohd and @foxanne.music