SpaceX fires up in-space version of Starship's Raptor engine for 1st time (video)

An important piece of SpaceX's new Starship megarocket just got its first workout. The first vacuum Raptor — the in-space version of Starship's Raptor engine — blazed up in a debut test at SpaceX's development facility in McGregor, Texas, company representatives announced via Twitter last night (Sept. 24).
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