Figure 8-21

Kuiper Belt Objects (a, b) These 1993 images show the discovery (bracketed by white lines) of one of at least 1524 known KBOs. These two images of KBO 1993 SC were taken 4.6 hours apart, during which time the object moved against the background stars. (c) The KBO 1998 WW31 and its moon (lower left).