“On Thursday, Mars’s Gale Crater was treated to a fantastic sight: a partial solar eclipse. An eclipse very similar to the kind we’re used to seeing from here on Earth, but with the sun blocked, in this case, by a different moon: Phobos, one of the two moons that orbit Mars. Fortunately for us, Curiosity was there to take a picture of Phobos’s transit. Fortunately for us, as well, Curiosity took precautions to protect its vision as the transit took place. (As NBC’s Alan Boyle put it: “You wouldn’t want Curiosity to blow out its camera on Mars.”) So, to capture the image above, the rover’s Mastcam used a neutral density filter that protected Curiosity’s imaging system in the same way that a pinhole projector protects human eyes during an eclipse. In Curiosity’s case, the filter reduced the Mars-seen sunlight to a thousandth of its natural intensity” (via What a Solar Eclipse Looks Like (When You’re Seeing It From Mars) - Megan Garber - The Atlantic).






