火卫一是一个形状不规则的小天体。火卫一是太阳系最暗的天体之一。围绕火星运动，一日围绕火星3圈，距火星平均距离约9378公里。
火卫二和火卫一可能是由于小行星的扰动与木星的作用才使它们围着火星运动的。
Deimos and Phobos may be due to disturbance of asteroids and Jupiter's role was to make them around Mars movement.
“火卫一步兵”探测器预计在今年晚些时候登陆火卫一，并于2014年取回地表样本。
The Russian Phobos-Grunt robotic spacecraft is scheduled to launch toward Phobos later this year and return surface samples in 2014.
雪茄由火卫一2所采取的倒数第二架形工艺铸造的对象显然是对火星表面的照片，在较早长方形阴影。
The cigar shaped craft in the penultimate frame taken by Phobos 2 is apparently the object casting the oblong shadow on the surface of Mars in the earlier photo.
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