What natural event in June 2018 caused Opportunity to cease operation?

Answer

A planet-encircling dust storm blocking sunlight.

The mission finally concluded in June 2018 due to a massive, planet-encircling dust storm that swept across Mars. This severe atmospheric event dramatically reduced the amount of solar energy reaching the surface, making it impossible for Opportunity’s solar panels to generate sufficient power to recharge its batteries. The rover transmitted its final communication on June 10, 2018. Despite NASA waiting patiently for the storm to clear, the rover failed to respond to subsequent wake-up signals, leading to the mission's formal declaration as complete in February 2019, ending the operational life of the machine that had defeated every other predicted failure point.

What natural event in June 2018 caused Opportunity to cease operation?

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