Phobos as Seen by ESA’s Mars Express spacecraft

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This image of Phobos, the largest and innermost moon of Mars, was taken by ESA’s Mars Express on January 10th, 2007. Below the moon you can see the limb of Mars. Phobos is irregularly shaped and has a mean radius of 11 kilometers. It has an albedo of 0.071, making it one of the least reflective objects in the solar system. Phobos is a heavily crated rubble pile covered in a fine regolith at least 100 meters thick. Everyday I post an image like this on r/Areology, feel free to check out that subreddit if you like this kind of stuff! Credit: ESA/DLR/FU Berlin


So what’s up with all the small craters that appear to be in straight lines?


That’s not a moon. It’s a captured fucking asteroid.