By SEAN MURPHY VAN HORN, Texas (AP) — For years, the official letterhead for the small town of Van Horn, tucked neatly among the foothills of the Guadalupe Mountains, read simply: “Farming, ranching, mining.” And while there is still some farming and ranching in this far West Texas community, and a talc mine still operates near the edge of town, there’s another booming business in its midst: space