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Virtually all observations of astrophysical objects and their physical processes are affected by the presence of dust either within the system being studied or along its line of sight . Mogadishu ’ s “ Islamic courts , ” who crushed the former capital ’ s CIA-sponsored warlords in the spring and by late fall were threatening to overrun the weak transitional government that U.N. mediators had precariously nursed into being , dramatically collapsed in the last week of 2006 in the face of Ethiopian intervention ; but ending Somalia ’ s long nightmare depends on whether the transitional government can wean itself away from its alien protector and consolidate its authority with an African peacekeeping force authorized by the Security Council in early December . In addition to its importance as a cosmochronological testbed , the M4 white dwarf sequence thus provides valuable insight into the search for dark matter and / or the microlensing population . Long distance entry also enables SBC to expand its focus on international calling . This room has been described to me and many others as one of the most beautiful in America , and since Russell knew it well , I regret its absence from his book .