This picture shows the same area but from a different position, its not high rez enough to zoom in to see if it's still there.. I wonder if nasa has higher rez images on its servers.
Certainly looks cool! Yeah the shadow totally does seem to not make it seem as if it's attached to anything behind.
https://mars.nasa.gov/raw_images/786860/
[You must be logged in to view images. Log in or Register.]