Explains the physics of gravity and gravitational pull, offering information on the contributions made in this area by Copernicus, Galileo, and Newton.
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.