Why Japan Probably Won't Have a Space Elevator by 2050

Japanese construction company Obayashi wants to build an elevator to space — and they want to use carbon nanotubes to get there. The Tokyo-based company plans to use 60,000-miles of the cylindrical carbon structures, anchored to Earth's surface, to shuttle an elevator to and from a distance about a tenth of the Moon's… » 2/24/12 1:20pm 2/24/12 1:20pm