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Cover Figure


COVER A radar-derived model of Alpha, the larger half of the binary near-Earth asteroid (66391) 1999 KW4. Alpha is an unconsolidated aggregate 1.5 kilometers in diameter; its effective slope ranges from zero (blue) to 70° (red). Its rapid 2.8-hour rotation induces material to flow (arrowheads) from both the northern and southern hemispheres toward the equator. See pages 1276 and 1280. Image: NASA/JPL

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Science. ISSN 0036-8075 (print), 1095-9203 (online)