Gravity and the Rotation of Galaxies

AI Thread Summary
The discussion focuses on understanding the relationship between gravity and the rotation of galaxies for a lab assignment. Key points include the need to analyze differences in data sets and whether observed speeds align with the equation v = √Gmg/r. Methods for estimating a galaxy's mass typically involve virial theory, while its radius is determined through observational data, both of which are approximate. The gravitational constant G is often assumed, allowing for variability in results. Assistance is requested to clarify these concepts for the lab.
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hey i need help! We are doing a lab on the above title and I have no idea how to do it.
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 = √Gmg/ 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!
 
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Galaxy mass, usually by virial theory. Radius by observation. Both methods are approximate. G is assumed. Wiggle G and any result is possible.
 

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