The size of this image is comparable to Google Maps. Go to Google maps and zoom out as much as possible. The bottom right hand corner should display a line mea

The size of this image is comparable to Google Maps. Go to Google maps and zoom out as much as possible. The bottom right hand corner should display a line measuring 1000 miles. Then zoom in so that the line measures 1 mile. This is the same as zooming out on this map so to 30 degrees, then zooming in to 100 arcsec. Google maps can zoom in a bit more to 20ft, but it's still impressive.