Comets, those icy objects from the far reaches of the solar system, pass Earth at regular periods in their orbit around the Sun. From Halley's to Hale-Bopp, comets have long captured our imagination.
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.