The search for the million megaton menace that threatens life on Earth.

The twentieth century has been a disappointment, comet-wise, but the object now approaching, Comet Hale-Bopp,bears a striking resemblance to the Great Comet of 1811,the biggest ...

Follows the comet through one full 7.6 billion mile circuit, explores history leading to present understanding of comets, emphasizes the work of Edmond Halley, and discusses ...

Explains what comets are, how they are formed, and how their unusual orbits bring them into earth's view at predictable intervals, with a special focus on Halley's comet.