Hmm. Well, infrared (from the Sun) and other sources of heat definitely eat away at ice, but that’s more of a thing near the south pole, where the CO2 ice goes away every spring. Rocks have been known to crack due to repeated heating and cooling, yes, so you’ve got the first part of erosion, the breaking part. Moving/transporting broken fragments is another matter, though.
Cosmic rays do cause damage to rocks, but on a much finer scale than the cracking referred to above - you’re not going to get big chunks of the rock to break off as a result. Meteorites and Lunar samples definitely show tiny streaks (“cosmic ray tracks”) when viewed under the microscope, and I’m sure fresh Mars samples will show them as well, but it’s not the kind of thing a rover (or human) would see in the field.
Hmm. Well, infrared (from the Sun) and other sources of heat definitely eat away at ice, but that’s more of a thing near the south pole, where the CO2 ice goes away every spring. Rocks have been known to crack due to repeated heating and cooling, yes, so you’ve got the first part of erosion, the breaking part. Moving/transporting broken fragments is another matter, though.
Cosmic rays do cause damage to rocks, but on a much finer scale than the cracking referred to above - you’re not going to get big chunks of the rock to break off as a result. Meteorites and Lunar samples definitely show tiny streaks (“cosmic ray tracks”) when viewed under the microscope, and I’m sure fresh Mars samples will show them as well, but it’s not the kind of thing a rover (or human) would see in the field.