Is this the side of a famed Dalmatian dog, or the surface of Mars? It’s the latter! These dark spots are the result of sublimation, when ice under the surface gets heated and turns directly into a gas. This exposes darker material that look like dark spots.
Over time, even these will fade, but newer spots will appear. The ice here is made of carbon dioxide.
Image is less than 5 km (3 mi) across and is 250 km (156 mi) above the surface. For full image including scale bars, visit the source link.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse