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Welcome to this question and answer site about advanced Physics, from graduate-level and beyond, including Theoretical Physics, Phenomenology, Experimental Physics, and Astronomy. On-topic subtopics will include String Theory, Loop Quantum Gravity, String Phenomenology, advanced Quantum Field Theory, Experimental Techniques, etc and for Physicists relevant Mathematical Topics.

If you want to know about physics at a simplified popular level, you can ask here

http://www.quora.com/
for more introductary than graduate level physics, you can go here

http://physics.stackexchange.com/questions
Purely mathematical questions that do not have to be of interest for physicists are discussed here

http://math.stackexchange.com/questions
or at research-level here

http://mathoverflow.net/
Thanks for your registration !