Moons of Mars
火星的卫星
  德imos 磷火 |
The small rocky moons of Mars, Deimos and Phobos, are irregular in shape and comparable in size to the asteroid Gaspra. The three objects are shown at the same scale and almost the same lighting conditions in the image below. All three bodies have irregular shapes, testament to their violent histories. Their surfaces are distinctly different, most likely because of very different impact histories. The Gaspra image was taken by the Galileo spacecraft on October 29, 1991 and the images of Deimos and Phobos were taken by Viking Orbiter in 1977. 火星的小岩石卫星德imos和福伯斯形状不规则，大小与小行星加斯普拉相当。下图中这三个天体以相同的尺度和几乎相同的光照条件显示。所有这三个天体都有不规则的形状，这证明了它们动荡的历史。它们的表面明显不同，很可能是因为撞击历史非常不同。加斯普拉的图像是由伽利略探测器于1991年10月29日拍摄的，德imos和福伯斯的图像则由维京轨道器于1977年拍摄。
All the images are NASA images, with the composite below built up from individual images from the NASA websites. 所有图像均为NASA提供的，下方的合成图像由NASA网站上的单张图像拼接而成。
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Solar System Illustration
Solar System Concepts
索引 太阳系示意图 太阳系概念
| HyperPhysics********** Astrophysics
HyperPhysics ********** 天体物理学 | R Nave |
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