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Science (American Association for the Advancement of Science), 2011-06, Vol.332 (6036), p.1396-1400
Ort / Verlag
Washington, DC: American Association for the Advancement of Science
Erscheinungsjahr
2011
Quelle
Science Online_科学在线
Beschreibungen/Notizen
Understanding how comets work—what drives their activity—is crucial to the use of comets in studying the early solar system. EPOXI (Extrasolar Planet Observation and Deep Impact Extended Investigation) flew past comet 103P/Hartley 2, one with an unusually small but very active nucleus, taking both images and spectra. Unlike large, relatively inactive nuclei, this nucleus is outgassing primarily because of CO 2 , which drags chunks of ice out of the nucleus. It also shows substantial differences in the relative abundance of volatiles from various parts of the nucleus.