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 approachable and authoritative guide to the cosmos answers these questions, and more.

Using the Companion Format

Taking advantage of the distinctive Companion format, readers can use the extensive, cross-referenced background chapters as a fascinating and accessible introduction to the current state of cosmological knowledge — or, they can use the convenient A-Z body of entries as a quick reference to a wide range of terms and concepts.

Sample Entries

Entries include topics such as: Black Hole; Doppler Effect; Fermi, Enrico; Heat Death of the Universe; Life in the Universe; Olbers's Paradox; Quantum Field Theory; Supernova; and much more.