Michael P Rogers: 6 books

An experimental atomic powered rocket from Earth goes out of control and crashes on an alien planet killing millions. They want revenge very badly, so they build a robot death ship and send it on its way to find and destroy the murderers of their people.

The Zrilkons had travelled millions of miles through space when their engines failed and the craft fell towards Earth, crashing in the Arizona desert. When the UFO was discovered, it was hoped that its secrets could be unfolded. Things didn't work out quite so well as expected....

A race of robots descends on Earth intent on colonising it using high-tech trickery. They leave empty handed.

An optimistic attempt was made at a research laboratory to build a device that would simulate the black hole effect. The far reaching consequences weren't realised until it was too late. Much too late for the technician who tested it.

Alien artefacts were discovered on the Moon during a survey. The purpose of them was surprising, at the very least.

An electronics enthusiast builds a satellite receiver that can receive deep space transmissions. He picks up a broadcast from outer space outlining an attack on Earth. The aliens could destroy Earth as easily as snuffing out a candle. What can be done to stop them?