Sir Richard Branson’s Virgin Orbit rocket has failed to launch a test satellite into space on its maiden voyage.
The first test launch of the new rocket appeared to be going well until moments after it was dropped from beneath the left wing of the jumbo jet, Cosmic Girl.
Virgin Orbit tweeted: “We’ve confirmed a clean release from the aircraft.
“However, the mission terminated shortly into the flight.
“Cosmic Girl and our flight crew are safe and returning to base.”
The 70-foot-long (21.3 metre) rocket was released over the Pacific Ocean off the coast of southern California after the highly modified plane took off from Mojave Air and Space Port in the desert north of Los Angeles.
It was supposed to fall for a few seconds before the first of its two stages ignited and hurtled it down the coast towards the South Pole before its satellite went into a low Earth orbit.
Virgin Orbit had been hoping the flight would help them gather data on every step of the launch process rather than to have a working satellite in orbit, with the satellite intended to orbit very low to avoid contributing to the problem of space litter.
Will Pomerantz, Virgin Orbit’s vice president for special projects, said during a preflight briefing on Saturday that about half of first rocket launches fail.
“History is not terribly kind, necessarily, to maiden flights,” he said.
Elon Musk, who owns rival company SpaceX, tweeted that he was sorry the launch had not worked.
“Orbit is hard. Took us four attempts with Falcon 1,” he said, which Virgin Orbit said it appreciated.
Chief executive officer Dan Hart said during the briefing that there had been numerous tests, discussions and introspection to verify that the system was ready.
“In the end the questions are always, has everything been thought about and are there any gaps or seams, and those are the questions you only learn when you commit to flight,” Hart said.
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