Aliens, if they exist, are most likely to live along the line between shadow and light, a temperate region known as the terminator, the scientists said.

“如果上面真有外星人，他们可能会住在昼夜分割线附近，这样就可以随意穿梭于黑夜与白昼之间了。”某科学家如是说。

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The qualities of a shadow depend on the light direction and intensity, as well as the distance between the object and the surface where the shadow is cast.

阴影深度取决于光照方向和强度，以及物体和投影面的距离。

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This is generally because a larger light source will create a smoother transition between light and shadow, or what you might call softer light.

大光源就是所谓的柔光，也就是亮部与阴影之间的过渡比较柔和。

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And in March, good light stopped play between New Zealand and England when a troublesome shadow had encroached onto the pitch, making it hard for the batsmen to see the ball.

BBC: Cricket finds new excuse

Since atoms have well understood light absorption properties, predictions can be made about the depth of a shadow cast, improving communication between the individual atoms performing calculations.

ENGADGET: Researchers capture a single atom's shadow, has implications for quantum computers