This image is part of a wider system of depressions that spiral outward from the very center of Mars’ north pole. Seen in context, you can see rippling troughs that curve and bend and slice outwards from the pole counterclockwise.
What a week it’s been for planets! Jupiter and Venus – the 2 brightest planets – were in conjunction last Sunday. Then the moon swept through the evening sky, passing Jupiter, Venus and Saturn. Thanks to all in the EarthSky Community who contributed photos! A sampling here … Links to more in this post.