APOD 2.1 (A Bucket Wheel Excavator on Earth)

I chose this picture for three reasons.  The first reason is that the NASA crawler that transports the Space Shuttle is dwarfed by this, making it bigger than the largest astronomy-based vehicle ever made.  The second reason is that this could be extremely helpful if we ever need to terraform an extra-terrestrial planet in order to make it inhabitable (example: planet has perfect atmosphere and gravity, but there are so many mountains that farming is nearly impossible).  The third reason is that it is very nice to look at, as are most of the other pictures I have chosen.