Sky Alert! explores what our world would be like, looking in turn at areas where the loss could have catastrophic effects. The book

- demonstrates our dependence on space technology and satellites;

- outlines the effect on our economy, defense, and daily lives if satellites and orbiting spacecraft were destroyed;

- illustrates the danger of dead satellites, spent rocket stages, and space debris colliding with a functioning satellites;

- demonstrates the threat of dramatically increased radiation levels associated with geomagnetic storms;

- introduces space as a potential area of conflict between nations.