The Black Planet (Steven Gordon, #2)

In this second adventure, Steven and his friend reach out into our solar system. Halfway between our sun and the Great Barrier they come across a previously undiscovered Black Planet. While exploring this strange new world they come across a strange alien structure, and what they find inside will change human history forever. A desperate race ensues to save mankind from a dreadful foe. Steven finds himself having to drag the human race up by its bootstraps and into a new age.