The discovery of compact objects, such as quasars and pulsars, and of the microwave background radiation, as well as the recent insight that astrophysical observations can illuminate elementary particle physics have greatly enhanced the interest in general relativity, which forms the theoretical background for these investigations.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.