Astronomy Today delves into new developments in the equipment scientists use to explore the universe, and discusses the characteristics they use to determine whether a celestial body is a planet, a... This description may be from another edition of this product.
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.