The Gun - (Formatted & Optimized for Nook)

The e-text was designed for optimal navigation on eReaders and other electronic devices. Within seconds, you'll be able to read any part of the book that you want! It's been formatted for the Nook to allow you the best reading experience.
------
The plot centers around a group of space explorers who investigate a planet which appears deserted. However, they are shot down and crash land on the planet. While repairing their ship, a team of explorers sets to survey the surrounding area, where they discover the ruins of an ancient city. Upon further investigation, it is revealed that the gun which shot them down is in the city, and is programmed to shoot anything down which enters the airspace above the city...