Private rocket to attempt second launch

 作者:昝试璺     |      日期:2017-12-22 08:02:32
By Kelly Young (Image: Space X) SpaceX, a rocket start-up company led by PayPal founder Elon Musk, will try to launch its second rocket on Tuesday, nearly a year after its first failed due to a fuel leak. It is actually the second attempt at lift-off for this rocket. The company, formally known as Space Exploration Technologies, tried to launch its Falcon 1 rocket from Kwajalein Atoll in the Pacific Ocean on Monday night. But a few minutes before lift-off, the ground control software called for a delay. The software told the range to switch from landline to radio communications – a change that took a few hundred milliseconds. But this tiny lag created a discrepancy between the hardware making the change and the software commanding the change, which caused the system verification software to abort the countdown. “Our simulations done beforehand all passed, because the simulator did not account for a hardware-driven delay in the transition,” Musk wrote in an online update on Tuesday. The launch team fixed the software and went through several simulated countdowns on Monday after the delay was announced. The launch window opens at 1900 EDT (2300 GMT) on Tuesday. This is the agency’s second demonstration flight for the US Defense Advanced Research Projects Agency (DARPA). Unfortunately, its first launch on 24 March 2006 ended in failure 29 seconds into the flight due to a fuel leak (see Fire destroys rocket’s maiden flight). SpaceX is also working on its Falcon 9 rocket and Dragon spacecraft, which they hope to use to haul cargo and crew up to the International Space Station. Along with competitor Rocketplane Kistler,