One of the Curiosity rover’s tasks was monitoring the atmospheric composition of Mars, and the data collected has revealed unusual changes in the atmosphere over the course of the Martian year–perhaps the Mars equivalent of seasons!
Oxygen, in particular, peaks in the spring and summer. Scientists indicate that “The variation suggests that the oxygen is being created by something, then taken away.” But the scientists have also been unable to discern the cause of this fluctuation. More study and theories are needed to get to the bottom of this.
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