The world’s heaviest commercial satellite has finally got off the ground, onboard a European Ariane 5 rocket. A first launch attempt was halted just 15 seconds before lift-off, after a technical problem was registered on the launch pad.However, over an hour later, everything went according to plan and the Ariane 5 rocket blasted off from the Kourou spaceport in French Guiana. The payload is the THAICOM 4 (IPSTAR) satellite, weighing over 6,000 kg. It will provide internet access services to 14 countries in the Asia-Pacific region. The launch is the 166th since Ariane rockets first went into service.