is the result of combining 25 nearly-identical images taken by the IMP camera, using a technique called super-resolution developed at NASA Ames Information Sciences Division by Peter Cheeseman, Bob Kanefsky, Robin Hanson, and John Stutz.
A typical input image, scaled up by a factor of five with the pixels interpolated so so it's blurry rather than blocky, looks like this:
Here's the input image expanded normally so you can see how coarse the pixels are: