Real images of Mars in 4K

What caught my attention most was the lack of ice, because even here on Earth and in colder regions, we have snow-capped mountains, among other things... and of course, this is due to the lack of water. Scientists have discovered a small river that remains liquid during the warmest periods on Mars, but due to a chemical element in the water that lowers the temperature at which water becomes liquid, they also discovered evidence that thousands of years ago there was a small ocean.