ESA’s ExoMars Trace Gas Orbiter has detected glowing green oxygen in Mars’ atmosphere—the first time that this emission has been seen around a planet other than Earth.
On Earth, glowing oxygen is produced during polar auroras when energetic electrons from interplanetary space hit the upper atmosphere. This oxygen-driven emission of light gives polar auroras their beautiful and characteristic green hue.
The aurora, however, is just one way...
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