An anonymous reader writes "This evening's planned launch of the Orbital Sciences Antares rocket had to be canceled just 12 minutes before liftoff, due to the unexpected separation of the booster's umbilical cable while the vehicle was on the launch pad. This is the first attempt to fly the Antares rocket, which is a commercial craft and direct competitor to the SpaceX Dragon 9. Beyond being the first flight of a brand new commercial rocket, this mission is also notable for carrying three of NASA's PhoneSats; small satellites powered by Android running on Nexus smartphones. With each PhoneSat costing just $3,500, they're designed to test the limits of extremely low cost spacecraft, similar to the European STRaND-1 mission. Since this is simply an orbital test, and the Antares will not be attempting to dock with the International Space Station, the launch window is highly flexible. It's anticipated Orbital Sciences will make another attempt at launching the Antares within 48 hours."