|Was this image taken with a telescope or a microscope?
Perhaps this clue will help: if the dark forms were
they would each span over football field across.
What is actually being seen are large sand dunes on the floor of
Proctor Crater on Mars.
The above picture was taken by
on board the
Mars Reconnaissance Orbiter (MRO),
a robot spacecraft currently in orbit around Mars.
The dark rippled
dunes likely formed more recently than the
lighter rock forms they appear to cover, and are thought to
slowly shift in response to pervasive
arise from a complex relationship between the sandy surface and
high winds on Mars.
were first seen in Proctor Crater by
Mariner 9 more than 35 years ago.
LPL (U. Arizona),