They fade into and out of view, rather than popping in and out, and the fading reverses direction as the cursor moves over and away from the HTML elements.
它们淡入和淡出视图，而不是直接跳出和消失，而且当鼠标进入和离开HTML元素时淡化方向相反。
After reaching about half of the Earth-Sun distance from the Sun, the comet should fade rapidly as it then heads out of the inner Solar System.
到达距太阳半个日地距离之后，彗星会因朝着内太阳系之外急速前进而快速变暗。
After reaching about half of the Earth-Sun distance from the Sun, the comet should fade rapidly as it then heads out of the inner Solar System.
到达距太阳半个日地距离之后，彗星会因朝着内太阳系之外急速前进而快速变暗。
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