This is the rocket that literally lights itself on fire before it heads to space. It’s the world’s largest rocket entirely fueled by liquid hydrogen, a propellant that is vexing to handle but ...

It's the final countdown for Delta IV Heavy, United Launch Alliance's powerful rocket. And it's one you won't want to miss. When it launches. At 2:47 p.m. EDT Thursday, March 28, ULA called a scrub.

Delta IV Heavy rocket has 3 Delta IV core stages. Each rocket engine produces up to 702,000 pounds of thrust. The engines aren't small: Just one engine weighs about 14,876 pounds and is 17 feet in ...