Jeff Bezos' Blue Origin is set for an inaugural launch of its giant New Glenn rocket on Sunday, a long-awaited first leap to Earth orbit that sets up one of the biggest challenges yet to industry dominance enjoyed by Elon Musk's SpaceX.

Bezos' New Glenn and Musk's Starship both are heading for launch, and both could lift off in close timing to each other. Here's what we know.

Blue Origin says it's delaying the first launch of its New Glenn rocket due to unfavorable weather conditions for landing the booster.