Seven years ago this week I was preparing one of my favorite lectures for The Formation and Evolution of Planetary Systems, a class I frequently teach at Caltech. “Preparing” is probably the wrong word here, because this lecture, called The Edge of the Solar System, was one I could give even if instantly wakened from a cold deep sleep and immediately put on stage with bright lights in my eyes and an audience of thousands and no coffee anywhere in sight. The lecture explored what was known about the edge of our main planetary system and the ragged belt of debris called the Kuiper belt that quickly faded to empty space not that much beyond Neptune. Conveniently, one of my most active areas of research at that time was trying to figure out precisely why this ragged belt of debris had such an edge to it and why there appeared to be nothing at all beyond that edge. I could wing it. So instead of preparing the lecture, I really spent that morning doing what I did whenever I had a few spare moments: staring at dozens of little postage-stamp cutouts of pictures of the sky that my telescope had taken the night before and my computer had flagged as potentially interesting. Interesting, to my computer, and to me, meant that in the middle of the postage stamp was something that was moving across the sky at the right rate to mark it as part of the Kuiper belt. I was not just lecturing about this debris at the edge of the solar system, I was looking for more of it, too.
Many objects out in the Kuiper belt have shockingly elongated orbits like Sedna. For almost all of these objects, this characteristic makes sense. These small leftover pieces of debris have been kicked around by planets throughout their existence. Whenever they come too close to one of the planets (usually Neptune, since it is the closest to these objects), they get a gravitational kick that can send them on a looping orbit to the distant outskirts of the solar system. But – and this is the key part here – unless they get kicked all the way out of the solar system, they always come back to where they were kicked. If you get kicked by Neptune, you can go zooming off into the unchartered regions far beyond the Kuiper belt, but you will come back to see Neptune again. When we look at the Kuiper belt, we see the results of all of this kicking clearly: the Kuiper belt objects that come closest to Neptune are on the most elongated orbits. Those far away are more free to go about their circular orbiting lives.
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