"What if?" questions have always stimulated people to think in new ways. "What if the Earth Had Two Moons" leads us on a fascinating 10 world journey exploring what the Earth would be like if conditions in the universe were slightly different. The answer: Earth would be different, often in ways that[...]

"Discovering the Universe" is the bestselling brief text for descriptive one-term astronomy courses (especially those with no mathematics prerequisites). Carried along by the book's vibrant main theme, "the process of scientific discovery," the Ninth Edition furthers the book's legacy for presenting[...]

The ninth edition develops the main theme, 'the process of scientific discovery', through the clear, accurate presentation of key concepts found in previous editions. Updated with current research and modern theories of solar system formation, an 18-month access card for the planetarium software pac[...]