Bright Ice Below
Image Credit: NASA/JPL/Space Science Institute
From NASA
Rhea's crater-saturated surface shows a large bright blotch, which was likely created when a geologically recent impact sprayed bright, fresh ice ejecta over the moon's surface.
The rim of the great Tirawa impact basin can be seen near the top of the image. The giant feature is approximately 360 kilometers (220 miles) across.
This crater and ejecta patterns resembles Tyco, but not as widely distributed. I wonder how similar they are in age?