By Alexandra Innanen
The North Pole of Mars is a pretty cool place – pun absolutely intended. This summer I’ve joined Giang in looking for patterns in the Martian ice cap, something he talked about in a previous post. I have looked through a truly astronomical number of HiRISE images, nearly 1000 at this point. While many of them do showcase those beautiful patterns we’re looking for (I have been known to punch the air at a particularly uniform set of dunes), a number are what I lovingly refer to as ‘garbage’. Some of these are just flat nothingness, with no distinguishing features to recommend it. Some are more visually interesting, but without any sense or uniformity. These are fairly useless in terms of patterns, but can be fun to look at, and sometimes have neat stories behind them.
I have a folder on my laptop called “Space Stuff” which I could easily rename “Nifty Pictures of Mars” at this point. It’s full of HiRISE images that I looked at and went “well, there’s no pattern there but boy is that cool!” I’m going to show off my top five images here.
Okay, the one at the top of this article is probably the coolest. Should I have ended with it? Is everyone going to leave now? Anyway, this is an avalanche at the edge of the layered deposits of the north pole, which fall off in steep cliffs (reminding me a bit of the Scarborough Bluffs near where I live). You can see the layering in the escarpment, and the edge of the ice in the lower left corner. Here’s some perspective: the dust cloud you can see is about 200 m across. That’s nearly two football fields long. This led me to another image taken in 2008 showing FOUR avalanches, which readers are encouraged to peruse at their leisure.