Provides an introduction to comets and asteroids and gives step-by-step directions for interactive projects, including creating models of various celestial objects, experimenting with gravity, and building a refracting telescope.

"When dark comet UD3 was spotted near Jupiter's orbit, its existence was largely ignored. But to individuals who knew better -- scientists like Benjamin Schwartz, manager of NASA's Center for Near-Earth Object Studies -- the threat this eight-kilometer comet posed to the survival of the human race was unthinkable. The 150-million-year reign of the dinosaurs ended when an asteroid impact generated more than a billion times the energy of an atomic bomb....

What happens when two massive hunks of hurtling space debris slam into each other? Welcome to round one in the Cosmic Collisions series-an exciting children's debut from an expert astrophysicist.

"Amazing photography accompanies engaging information about comets. The combination of high-interest subject matter and light text is intended for students in grades 3 through 7"--

Presents facts and information about comets, asteroids, and meteoroids including their origins and their significance to Earth.

As a comet approaches the earth, each individual struggles in the face of extinction to find what most matters to him or her.

A family fights for survival as a planet-killing comet races to Earth. John Garrity, his estranged wife Allison, and young son Nathan make a perilous journey to their only hope for sanctuary.

"Every evening, from the time she was a child, Maria Mitchell stood on her rooftop with her telescope and swept the sky. And then one night she saw something unusual--a comet no one had ever seen before! Miss Mitchell's extraordinary discovery made her famous the world over and paved the way for her to become America's first professional female astronomer."--

When humanity worldwide is in danger of being wiped out by an impending catastrophe, John Garrity has four days to secure his wife Allison and his son Nathan. While chaos reigns widely, John has to rush against the clock to take his loved ones in New York to a secret military bunker in Greenland. -- Provided by publisher. As cities around the world are being destroyed by a comet, a family races against time to reach a possible safe haven.

Have objects from space ever hit Earth? Yes! Every day small meteoroids crash into the atmosphere. Some burn up, but some hit the ground. Space junk also falls to Earth. Comets and asteroids struck Earth long ago. In this book, you'll learn how scientists watch out for large collisions and what they might do if Earth is in danger. As part of the Searchlight Books collection, this series explores outer space and sheds light on the question What's Amazing...