Learning about the universe or special/general relativity I have done a standard course in differential geometry/Riemannian geometry. Am I now able to understand the concepts people talk about when they say things like "spacetime is curved" and when I see things like outer space looking curved. Does one need to know other physics concepts or can I just learn it from now?
Can anyone recommend me anything to learn it from? I want to learn about things like black holes and metrics and want to avoid things like electromagnetism etc.
Thanks

There's a book about general relativity aimed specifically at math undergrads: http://www.amazon.com/General-Relativity-Springer-Undergraduate-Mathematics/dp/1846284864
Here's another book from the same author and series, only about special relativity: http://www.amazon.com/Special-Relativity-Springer-Undergraduate-Mathematics/dp/1852334266
