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Boeing’s Starliner started making a repeating ‘pulsing’ sound yesterday

US astronaut Barry Wilmore called NASA ground crew on Saturday, asking for help with a repetitive knocking sound that was coming from the Boeing Starliner craft. The interaction was captured by a NASA Space Flight forum member, who included a recording of it in a post that was spotted by Ars Technica. In the recording, Wilmore asks NASA crew in…