Browsing the HiRISE observations of Mars, I noticed that there aren't any observation footprints at a latitude lower than -65° or higher than 65°. Why is this? Is there something I am not seeing? Is there a technical reason why these observations can't be done at the high latitudes?
Disclaimer: I didn't look at the entire map, but I did look at a few different longitudes to see if the 65° limit was consistent across the planet.