Last week, Tesla Motors (TSLA -1.92%) founder Elon Musk won a big victory for his other company, Space Exploration Technologies. News that SpaceX will be sending the GoreSat into orbit in 2014, and the STP-2 stack of satellites up a year later, is merely "interesting" for investors hoping SpaceX will eventually launch an IPO -- but it's downright crucial to shareholders of Boeing (BA -0.24%) and Lockheed Martin (LMT 1.71%).

These aerospace giants could find their profit margins from space tech absolutely crushed by the introduction of real price competition from Musk's upstart rival. Fool contributor Rich Smith explains why.