text: In 1998 they had the on borad MGS taken a few pictures and had look like there was pymarids on mars. Cause of the shadows that the landform was making. 41 degrees north and that winter in april for Mars so there alot of clouds. But nasa had prepared took look one last time they said was super hard and alot of work. Because it like fax machine in narrow 2.5km wide strips. they said it just does not pass over face very often.