Fig. 4.61 Spitzer observations of two comets showing dust trails at 24 μm wavelength using the
MIPS instrument. Top: 2P/Encke. The white lines indicate the dust trail. Credit: NASA/JPLCaltech/M. Kelley (Univ. of Minnesota). Bottom: 67P/Churyumov-Gerasimenko. Credit: NASA/
JPL-Caltech/W. Reach (SSC/Caltech)
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4 Dust Emission from the Surface