All Things Space, UFOs, etc.Previously believed to be mostly rock, Mars’ glaciers shown to be 80% pure ice Posted on August 13, 2025 by Administrator Seen through an orbiter’s camera, the flanks of Martian volcanoes and crater walls often look as if thick syrup once oozed down them and then became crusted with rouge‑colored dust. For years, scientists believed those viscous tongues formed from piles of rocky rubble lightly cemented by ice.