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Hi I have two questions the first one is: can I understand the general relativity in simple way? The second question is: How can I calculate the mass of galaxy if I have the redshift of it?

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Only YOU know what you are able to understand. Curl up with a good book on General Relativity/ Cosmology and start reading. If you understand most of the introduction then you are mentally fit to read the rest.

As to the red shift and mass distribution. Scientists are still working on it.
Here is quotation from the abstract of a PhD thesis that may convince to join in the fun.
"Gravitational redshift offers a new approach to studying the mass distributions of galaxies and clusters that requires many fewer assumptions regarding the underlying physics than many of the current methods. Unfortunately, it also suffers from a number of potential setbacks. Recent advances in instrument technology, combined with the careful selection of suitable targets should allow gravitational redshift to become a viable tool for studying the nature and distribution of dark matter."

Here is the link to the thesis.

By the way, your calculator is of no use to you in this matter.

Posted on Aug 23, 2010


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Posted on Jan 02, 2017


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