Explanations in this section should contain no formulas, but instead colloquial things like you would hear them during a coffee break or at a cocktail party.
Student
Recommended Textbooks:
The best introductions are Relativity, Gravitation and Cosmology by Ta-Pei Cheng and
The Early Universe by Edward Kolb and Michael S. Turner
Edward R. Harrison, Cosmology, the Science of the Universe