Blue Origin is counting down to the launch of its New Glenn rocket on an orbital mission that's been more than a decade in the making.

As pointed out by NPR, New Glenn has a similar carrying capacity to SpaceX’s Falcon Heavy rocket, but it stands out with a larger, 23-foot-wide cargo bay. If New Glenn’s launch is successful, it could heat up its rivalry with SpaceX as both companies vie to secure lucrative government contracts.

Blue Origin announced that it will launch its first New Glenn rocket from Cape Canaveral in Florida on Sunday. According to a press release from the company, owned by billionaire Amazon founder Jeff Bezos, a three-hour launch window would be opened between 1 a.m. and 4 a.m. ET on Sunday, January 12.