Last week, Tesla Motors (NASDAQ:TSLA) 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 (NYSE:BA) and Lockheed Martin (NYSE:LMT).

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.

Fool contributor Rich Smith has no positions in the stocks mentioned above. The Motley Fool owns shares of Lockheed Martin and Tesla Motors. Motley Fool newsletter services recommend Tesla Motors. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.