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Figure 4.1

The Milky Way. This color image {a close-up of the black-and-white image shown in Figure 4 I of the text) shows dust clouds silhouetted against the bright bulge at the center of our galaxy Notice that the dust makes the bulge look dimmer and redder,as interstellar dust removes more blue light than red tight. Courtesy of Axel Meflr^ger

Figure <4.2

Gravitational tensing by the galaxy cluster Abel I 2218. The curved arcs are gravitationally lensed images of background galaxies, whose light is bent by the matter (mostly dark) in this cluster of galaxies. Courtesy of NASA, A. Fcuchter and the EROTeam {STScl. ST-ECF).

5N 199SM 7=0*3

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