Hold-down firing nudges Falcon Heavy rocket closer to first liftoff

Hold-down firing nudges Falcon Heavy rocket closer to first liftoff  Spaceflight Now SpaceX fires engines on big new rocket in launch pad test  Chron.com Falcon Heavy: Big SpaceX rocket lights 27 engines  BBC News Elon Musk on Twitter: "Falcon Heavy hold-down firing this morning was good. Generated quite a thunderhead of steam ...  Twitter SpaceX Test Fires Its Falcon Heavy Rocket for the First Time  WIREDFull coverage

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