We are 
When will we see the first static fire of the engine?
Prometheus is a precursor of the future engines intended for use by Europe’s launchers by 2030! 
pic.twitter.com/slSAUno4R8
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First tests will begin in 2020 after manufacturing review , according to press release.
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@ClementFavaron @HollestelleArco@SimonRMerton
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Makes you wonder if they ever inspect what the competition has been up to, in recent years.
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A chemical rocket engine is the future? I think we see different futures
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unforeseeable turn of thoughts: Prometheus, at least the name now seems promising. It actually is quite cleverly chosen. One could now almost trust you with that fire-thruster. https://twitter.com/photopolarimet2 '
comment though rocketed the SS Black Pearl over the New Moon.
Wrech n' RowThanks. Twitter will use this to make your timeline better. UndoUndo
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Wonderfull news, interstellar missions at last. Continuous acceleration is the dream.!!!
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Is it possible to archive a clima neutral use of rockets, if they are methane based?
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yes,but the best is lox+hydrogen because the only thing that comes out is water
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