NASA’s Curiosity Rover Captures Strange Shimmering Iridescent Clouds on Mars

Curiosity Spots Clouds Over Mont Mercou

Curiosity Spots Clouds Over Mont Mercou: NASA’s Curiosity Mars rover captured these clouds just after sunset on March 19, 2021, the 3,063rd Martian day, or sol, of the rover’s mission. The image is made up of 21 individual images stitched together and color-corrected so that the scene appears as it would to the human eye. Credit: NASA/JPL-Caltech/MSSS

The science team is studying the clouds, which arrived earlier and formed higher than expected, to learn more about the Red Planet.

In the thin, dry atmosphere of Mars, cloudy days are pretty rare. Clouds are typically found at the planet’s equator in the coldest time of year, when Mars is the farthest from the Sun in its oval-shaped orbit. But one full Martian year ago – two Earth years – scientists noticed clouds forming over NASA’s Curiosity rover earlier than expected.

Curiosity GIF Shows Drifting Clouds Over Mount Sharp: This GIF shows clouds drifting over Mount Sharp on Mars, as viewed by NASA’s Curiosity rover on March 19, 2021, the 3,063rd Martian day, or sol, of the mission. Each frame of the scene was stitched together from six individual images. Credit: NASA/JPL-Caltech/MSSS

This year, they were ready to start documenting these “early” clouds from the moment they first appeared in late January. What resulted are images of wispy puffs filled with ice crystals that scattered light from the setting Sun, some of them shimmering with color. More than just spectacular displays, such images help scientists understand how clouds form on Mars and why these recent ones are different.

In fact, Curiosity’s team has already made one new discovery: The early-arrival clouds are actually at higher altitudes than is typical. Most Martian clouds hover no more than about 37 miles (60 kilometers) in the sky and are composed of water ice. But the clouds Curiosity has imaged are at a higher altitude, where it’s very cold, indicating that they are likely made of frozen carbon dioxide, or dry ice. Scientists look for subtle clues to establish a cloud’s altitude, and it will take more analysis to say for sure which of Curiosity’s recent images show water-ice clouds and which show dry-ice ones.

Curiosity Navigation Cameras Spot Twilight Clouds on Sol 3075: Using the navigation cameras on its mast, NASA’s Curiosity Mars rover took these images of clouds just after sunset on March 31, 2021, the 3,075th sol, or Martian day, of the mission. Credit: NASA/JPL-Caltech

The fine, rippling structures of these clouds are easier to see with images from Curiosity’s black-and-white navigation cameras. But it’s the color images from the rover’s Mast Camera, or Mastcam, that really shine – literally. Viewed just after sunset, their ice crystals catch the fading light, causing them to appear to glow against the darkening sky. These twilight clouds, also known as “noctilucent” (Latin for “night shining”) clouds, grow brighter as they fill with crystals, then darken after the Sun’s position in the sky drops below their altitude. This is just one useful clue scientists use to determine how high they are.

Curiosity Navigation Cameras Spot Twilight Clouds on Sol 3072: Using the navigation cameras on its mast, NASA’s Curiosity Mars rover took these images of clouds just after sunset on March 28, 2021, the 3,072nd sol, or Martian day, of the mission. Credit: NASA/JPL-Caltech

Even more stunning are iridescent, or “mother of pearl” clouds. “If you see a cloud with a shimmery pastel set of colors in it, that’s because the cloud particles are all nearly identical in size,” said Mark Lemmon, an atmospheric scientist with the Space Science Institute in Boulder, Colorado. “That’s usually happening just after the clouds have formed and have all grown at the same rate.”

Curiosity Spots Iridescent (Mother of Pearl) Clouds: NASA’s Curiosity Mars rover spotted these iridescent, or “mother of pearl,” clouds on March 5, 2021, the 3,048th Martian day, or sol, of the mission. Seen here are five frames stitched together from a much wider panorama taken by the rover’s Mast Camera, or Mastcam. (This image is just a small segment. Click to see the full, very wide panorama.) Credit: NASA/JPL-Caltech/MSSS

These clouds are among the more colorful things on the Red Planet, he added. If you were sky-gazing next to Curiosity, you could see the colors with the naked eye, although they’d be faint.

“I always marvel at the colors that show up: reds and greens and blues and purples,” Lemmon said. “It’s really cool to see something shining with lots of color on Mars.”


View Comments


      • Because he's an idiotic troll the type that volunteers for Trump and argue the world is flat so they can feel like they are smart despite their lack of understanding of science or being able to comprehend basic s***. This attitude is what happens when dumb people aren't weeded out by natural selection as the world continues to get safer for those who would of likely drowned trying to fight their own reflection in a puddle of water 50-100 years ago.

  • For those making comments about this being fake: We have seen clouds on Mars way before we ever landed a rover there. I have seen them through my 12inch reflector telescope, and I've seen the entire red planet become a dust storm. Don't believe me? Goto a star party or go buy a good telescope and look yourself. It's not magic, it's science and it's easy to do.

  • I am now not a believer. I have a picture of the drone on "MARS".... Let's just say I doubt there is a camera on the ground off to the right of the drone. Nice try NASA! Purely pissed.

    • You realize there is a Rover with it's own cameras that can see the drone and take pictures of it right? It must hurt to be so dumb.

    • You. Sound dumber than Trump and I'm sure you believe the pathological liar but can't accept reality. Sad. Hope you don't repoduce, I personally like our species and you pass on your genes is no good for it.

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