As recently as two decades ago, we thought our solar system was “normal.” That was pretty accurate as long as you didn’t look at it too closely. But now we know our system has some remarkable idiosyncrasies, which are especially obvious if you look at the dim spaces beyond Neptune. A prime example is Pluto’s oddball orbit, which is tilted by 17 degrees to the disk-shaped plane known as the “ecliptic” in which all the other planets travel around the sun.
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