Explanation: What if there were two moons in the sky -- and they eclipsed each other? This happens on Mars. The featured video shows a version of this unusual eclipse from space. Pictured are the two moons of Mars: the larger Phobos, which orbits closer to the red planet, and the smaller Deimos, which orbits further out. The sequence was captured last year by the ESAБs Mars Express, a robotic spacecraft that itself orbits Mars. A similar eclipse is visible from the Martian surface, although very rarely. From the surface, though, the closer moon Phobos would appear to pass in front of farther moon Deimos. Most oddly, both moons orbit Mars so close that they appear to move backwards when compared to Earth's Moon from Earth, both rising in west and setting in the east. Phobos, the closer moon, orbits so close and so fast that it passes nearly overhead about three times a day.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Публикации с ключевыми словами: Phobos - deimos - Фобос - Деймос Публикации со словами: Phobos - deimos - Фобос - Деймос
См. также: Маленький спутник Деймос Фобос: спутник над Марсом Фобос над Марсом Кратер Стикни Стерео-Фобос Фобос: обреченный спутник Марса Марсианское затмение: Фобос проходит перед Солнцем Все публикации на ту же тему >>