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More than three years after Curiosity first began its mission on Mars, the NASA rover finally had some time to observe — and photograph — its first sunset.

And yes, a sunset on the Red Planet is blue. Why? In simple terms, it comes down to dust.

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“The colors come from the fact that the very fine dust is the right size so that blue light penetrates the atmosphere slightly more efficiently,” Curiosity team member Mark Lemmon of Texas A&M University said in a statement. “When the blue light scatters off the dust, it stays closer to the direction of the sun than light of other colors does. The rest of the sky is yellow to orange, as yellow and red light scatter all over the sky instead of being absorbed or staying close to the sun.”

The effect prompted the Curiosity Rover’s Twitter account to quote T.S. Eliot: