Read section 8.9 and answer question 18 using this figure.

Figure 8.18: Uhuru X-Ray Sources

The first X-Ray satellite, Uhuru, produced this map of x-ray point sources in the 1970’s. (Uhuru is a Swahili word meaning “Freedom”) The size of the dots represents how bright the sources are in x-rays. Is there only one distribution of X-rays or are there two different distributions?


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