visible horizon [天] 视地平 ; 可见地平 ; 视地平线 ; 可见地平线
distance of visible horizon 水平视距 ; 视地平距离
the visible horizon 天文』可见地平线
WE CANNOT see what lies beyond the visible horizon of our universe, simply because light emitted beyond that horizon has not had time to reach us.
所以我们不能看到宇宙里可见视野之外，仅仅是因为在超越视野之外的物体所发射的光线已经没有时间来送达给我们。
The curvature of the Earth’s horizon (the limb) is clearly visible, as is the faint blue line of the upper atmosphere directly above it (at image top center).
地球地平线的曲线（周边）清晰可见，它的正上方隐约显现出高层大气的蓝线（图片中上部）。
The curvature of the Earth's horizon (the limb) is clearly visible, as is the faint blue line of the upper atmosphere directly above it (at image top center).
地球地平线的曲线(周边)清晰可见，它的正上方隐约显现出高层大气的蓝线(图片中上部)。
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