Mars is not just the red planet, but it is also the dusty planet. In the years Curiosity has been exploring the planet, she has built up a coating of dust so thick first sign of alien life may be one writing "WASH ME" on her.

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The Spirit and Opportunity Martian rovers relied on their solar panels to provide them with the energy to explore the red planet, but sometimes those panels get a wee bit dusty. While they got power-boosts from helpful dust-devils, the newer Curiosity abandoned the dependence on luck and went with a nuclear battery that turns heat into electricity instead. Good thing, too, as Curiosity has gotten very, very dusty!

Curiosity started off shiny-clean on the first few months on Mars, as demonstrated in this self portrait from sols 84.

Many months later on sols 613, Curiosity was coated in a thick layer of dust.

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Image processing by Thomas Appéré, who also constructed an animation flipping between the sols. Have you considered what goes on behind the scenes every time a rover takes a self-portrait?