Although scientists believe an octopus is most likely color blind, Paul may still be able to see horizontal lines, as well as levels of brightness and object size.
尽管科学家认为章鱼多半色盲，但保罗也许仍保留了一些对水平线条、明亮度、物体大小的感应。
The distance to such an object can be worked out by comparing its apparent brightness with its known, absolute brightness.
经过比较表观亮度和已知的绝对亮度，即可得出该天体和我们的距离。
The distance to such an object can be worked out by comparing its apparent brightness with its known, absolute brightness.
经过比较表观亮度和已知的绝对亮度，即可得出该天体和我们的距离。
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