Analysis of information sources in references of the Wikipedia article "Centaur (rocket stage)" in English language version.
Centaur 3 (which flies on the Atlas V rocket) is 3.8 meters in diameter. The very first Centaur we fly on Vulcan will go straight to 5.4 meters in diameter.
because it proposed to make first use of the theoretically powerful but problem-making liquid hydrogen as fuel.
because it proposed to make first use of the theoretically powerful but problem-making liquid hydrogen as fuel.