Anyone who heads outdoors during the late evening this week will surely notice, low in the eastern sky, the brilliant planet Jupiter outshining all else except the moon.

But there is something you won't see. Jupiter now lies almost directly along the same line of sight as the distant planet Neptune.

While both worlds are gas giants, that is where the similarity ends.

Jupiter is the giant of our solar system; 11 Earths would be needed to span its width. Yet for all its siz ...

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