The Kuiper Belt at 20: Paradigm Changes in Our Knowledge of the Solar SystemAugust 24, 2012
New Horizons remains healthy and on course, now more than 24 times as far from the Sun as the Earth is. This summer’s spacecraft and payload checkout went extremely well, as did both major flight-software updates we loaded aboard New Horizons. And, the spacecraft’s rehearsal of the closest-approach day of the Pluto encounter went just about perfectly.
After finishing all of this at the beginning of July, we put New Horizons back into hibernation, and we’ve been cruising that way for almost eight weeks. As those who follow New Horizons on Twitter (@NewHorizons2015) know, every Monday New Horizons checks in with a beacon that tells us if all is well, or not. And almost every week we’ve been able to report a “green beacon Monday” to our 22,000-plus Twitter followers, indicating the spacecraft is in good health.
New Horizons will cruise quietly in hibernation until Jan. 6, 2013, when we wake it up for a month of complex activities, including some advance work on next summer’s checkout, and the third of the four major software upgrades needed before next summer’s on-spacecraft rehearsal of the nine days surrounding Pluto closest approach.
Since activity on New Horizons is pretty quiet right now, I’ll take this opportunity to mention that planetary science is celebrating the 20th anniversary of the discovery of the Kuiper Belt. That came in 1992, when the first Kuiper Belt Object (KBO) was discovered.
Actually, of course, the first object in the Kuiper Belt was discovered in 1930 — Pluto itself; and the second such object, Pluto’s giant moon Charon, was discovered in 1978. The Kuiper Belt was first postulated — most famously by Gerard Kuiper — by planetary scientists back in the 1930s, ‘40s and ‘50s. But it took until 1992 for technology to mature sufficiently enough to find another object (outside the Pluto system) orbiting the Sun beyond Neptune.
Since 1992, more than 1,000 KBOs have been discovered. But only a tiny fraction of the sky has been surveyed for KBOs. It is estimated that more than 100,000 KBOs exist with diameters of 100 kilometers or larger, along with billions of smaller objects down to the size of cometary nuclei, just a kilometer or two across. (By comparison, Pluto is huge — its diameter is almost 2,400 kilometers, making a drive around its equator as far as from Manhattan to Moscow!)Most of the known KBOs are just 100 to 300 kilometers across, about one-tenth of Pluto’s diameter. But some are smaller than 100 kilometers across, and some are larger than 300 kilometers across. In fact, there is great diversity among KBOs:
But I don’t consider this surprising assortment of KBOs to be the most important contribution to our knowledge of the solar system that has come from telescope exploration of the Kuiper Belt. In my opinion, the three greatest solar system lessons we’ve learned from the Kuiper Belt are:
What an amazing set of paradigm shifts in our knowledge the Kuiper Belt has brought so far. Our quaint 1990s and earlier view of the solar system missed its largest structure! It didn’t know about the existence of dwarf planets, the most populous class of planet in our solar system —and very likely the galaxy. It didn’t even contemplate that dwarf planets would have such a wide range of colors, reflectivities, orbits and surface compositions. And it didn’t realize that the locations of most planets in our solar system today — even including some of the very largest planets — are different from where they were born.
Just imagine what our close flybys of the Pluto system and smaller KBOs, combined with new giant telescopes coming on line to probe the sky, will teach us about the Kuiper Belt in the next 20 years. It’s an exciting time, and its sometimes hard for me to believe after working on this since 1989, that our 2015 exploration of Pluto and its many moons is almost upon us—but it is!
Well, that’s my update for now. Thanks again for following our journey across the deep ocean of space, to a new planet and a truly new frontier.
Until I write again, I hope you’ll keep on exploring — just as we do!