If it doesn’t rain on Mars, how can a rainbow form in the sky?
The Persevering Wanderer captured the rainbow in the Martian sky.
You took this photo on April 4, 2021 (Sol 43) local time at 15:14:09 local time. With Perserverance’s desire to continue wandering around the Martian land, one of its rear cameras was used to detect and avoid obstacles (hazard cam or Hazcam), and something unusual was discovered: a picture was drawn on the Martian screen rainbow.
On the earth, a rainbow will appear after rain. When suspended water droplets in the atmosphere act like a prism, they will decompose the white light from the sun into primary colors. But there is no rain on Mars, so the future Martian colony will be deprived of rainbows, or so it seems.
Rainbow without water
There are several theories to explain this phenomenon. One is that it is caused by light reflected by tiny dust suspended in the Martian atmosphere. Therefore, what we see in the photo will be an extraterrestrial “dust arc”.
Another possibility is that it is produced by ice particles suspended in the atmosphere instead of water. There are two types of ice on the surface of Mars, especially at the poles: ice (frozen carbon dioxide, popular “dry ice”) and water ice. In this case, the arch will be an “ice arch”.
Ice on Mars
One of the most fascinating photos of the surface of Mars is the photos taken by the mission Mars Express From the Korelev crater. It is a 1.8 km thick layer of water ice that remains permanently on the top of the crater.
It is 82 kilometers in diameter and is located in the northern lowlands of Mars, just to the south of the vast sand dune-like terrain that surrounds part of the North Pole of the earth and is called Olympia Undae.
More interesting phenomena on Mars:
The mystery of Mars’ strange vertical cloud revealed