A Short History of Blue Origin Rocket Engines
Blue Origin launches another space tourism rocket from West Texas
'Best day ever': Jeff Bezos, Blue Origin rocket touch down after historic spaceflight
Blue Origin joins U.S. military ‘rocket cargo’ program
WATCH AGAIN: Winter Park couple heads to space on Blue Origin rocket
First, there is the enormity of the engineering challenge, which is due to Bezos' decision to opt for a larger New Glenn design.
They also announced the engine.
This would have represented a more incremental step for a launch company that has yet to put a gram of material into orbit.