The Kuiper Belt has been in the news lately, because the New Horizons space probe will be visiting it next year. The Kuiper Belt consists of a number of objects on the fringes of the Solar System (from about from about 30 to 55 AU out). Known objects in the belt are green in the image above (image by “WilyD”). Pluto is the best-known of these objects.
The belt is named after the great Dutch-American astronomer Gerard Kuiper (1905–1973), based on his 1951 PNAS article “On the Origin of the Solar System” (although it requires some imagination to see a prediction of the Kuiper Belt in this paper). The photo of Kuiper below is from the Dutch National Archives:
I’m looking forward to pictures from the Kuiper Belt next year!