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So there are few questions i wanted to know to ace this lab. lol i will really appreciate it if someone can help me.

- Describe the differences between the two sets of data. Is the observed speeds explained by the equation

v = √Gm

_{g}/ r ? Justify your answer

-Briefly describe some of the methods astronomers use to estimate the mass of a galaxy, its radius and the value of G.

Please, it will be really helpful if someone can help me!