Astronomy Picture of the Day . ... Mars Express , DLR , ESA Explanation: Where on this moon would you land? The moon pictured above is not Earth's moon but Phobos , the closest moon to the planet Mars. Phobos is so close to Mars that it is expected to break up and crash into the red planet within the next 100 million years. Earlier just this year, however, ESA 's Mars Express mission took detailed images of the area surrounding Phobos' South Pole. ... Phobos from Mars Express . ...