All matter, including galaxy clusters, galaxies, and their constituents follow orbits and flows driven by the net attraction of near and distant masses. The boo

Physics and astrophysics came to dark matter through many different routes, finally accepting it, but often with some distaste. It has been noticed that the exi

Just what is Einstein's Theory of Relativity? The Big Bang Theory? Curvature of Spacetime? What do astronomers mean when they talk of a 'flat universe'? This ap

We have entered the "Golden Age of Cosmology," where modern technology is allowing scientists to chart the cosmos to a depth and precision unimaginable until re

This is a collection of lectures on topics in cosmology and elementary particles with emphasis on astrophysics. Delivered by prominent scientists, the lectures