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D. Lynden-Bell (Institute of Astronomy and Clare College University of Cambridge)
After critical discussion of the observations that have a bearing on the nature and prevalence of all dark matter, we turn to discuss the possible nature of the baryonic fraction of dark matter that is neither in known stars nor diffuse gas. We are led by the discussion to consider formation of very small stars on a very long timescale in hot cooling flows. Here cooling condensations can develop even in the absence of gravity and it is shown that these condensations may occur even in neutral gas. Observations suggesting that 10 of the Galaxy's dark halo is baryonic are discussed.