http://www.bbcweb3hytmzhn5d532owbu6oqadra5z3ar726vq5kgwwn6aucdccrad.onion/news/science-environment-61494348
It's the perennial blight against which all solar-panelled missions to the Red Planet must battle. When InSight touched down on 26 November 2018, its black-coloured, sparkling clear wings were producing about 5,000 Watt hours per sol. Today, coloured red from all the dust, they can produce only one-tenth as much at approximately 500 Watt hours per sol.