I am looking for a book which I read as a teenager once, and now can not find anymore. I don't recall the title. I would be very grateful for ideas on how I might find it somehow.
A brief description: it was, as I recall, between one and two inches thick and had a normal size (slightly larger than A5). It was bound in a solid, red cover. It could be that it was supposed to have a dust jacket, but my copy did not have one. It was printed in Gothic script and felt old.
Content, as much as I remember:
The protagonist visits a scientist friend in his observatory. The scientist talks about his amazing discovery, namely a type of asteroid or planet (referred to in the book almost exclusively as a "star"), on a collision course with earth. Somehow, they then quickly build a rocket with which they fly there. On the planet live caveman-like natives with whom they establish contact. It turns out later that there exists another tribe, who wages war against them. Using the ideas of space travelers, the enemies are defeated and flee. I think the book ends with their return to earth, which is not yet destroyed by a collision, but I'm not sure at all.
In language and content, the book is in my estimation geared to young male readers. The content has on the whole book-length strong militaristic, and racial overtones, because of which I would imagine the book at the latest a product of the Nazis; not much older either. It may be that the title is something like "The strange star."