Monitoring Active Gullies
HiRISE PICTURE OF THE DAY: 23 AUGUST 2025
Monitoring Active Gullies

When gullies were first observed, there was a lot of excitement surrounding them because similar features form on Earth through the action of liquid water.



HiRISE Instrument News
Since July 23, 2023, HiRISE observations have lacked data from the RED4 CCD due to a hardware issue, creating a gap in the middle of image products and reducing the color swath to 1 CCD width. We are investigating the hardware issue and may be able to acquire some RED4 data in the future.

Glacier-like Features on Mars
It’s somewhat of a mystery why these features have flowed so much when they are so thin, the ice is so cold, and Martian gravity is so low.