Mars cloud: What is the plume spotted over Martian terminator (VIDEO).

What Is the Strange Cloud Hovering Over Mars? (Video.)

What Is the Strange Cloud Hovering Over Mars? (Video.)

Slate in motion.
Feb. 18 2015 8:15 AM

The Mars Plume

What caused the mysterious formation 150 mile above the Martian surface?

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Three years ago, amateur astronomers noticed a mysterious plume above the surface of the Mars. A new study in Nature confirms the formation is a true red planet mystery.