The initial construction of the massive airplane Paul Allen has been quietly building in the California desert is complete, and the vehicle, which would be the world's largest airplane with a wingspan wider than Howard Hughes's Spruce Goose, was wheeled out of its hangar for the first time on Wednesday.
Called Stratolaunch, the plane has some impressive stats: a wingspan of 385 feet (117 metres), or longer than a football field, and a height of 50 feet (15 metres).
Unfueled, it weighs 500,000 pounds (227,000 kg). But it can carry 250,000 pounds of fuel, and its total weight can reach 1.3 million pounds (600,000 kg).
But, really... how big is it? It's so big that it has 28 wheels and six 747 jet engines. It's so big that it has 60 miles (97 km) of wire coursing through it. It's so big that the county had to issue special construction permits just for the construction scaffolding.
It's so big that, to truly get a sense of it, you have to see it from a distance - like a mountain.
But why is Allen, the co-founder of Microsoft and owner of the Seattle Seahawks, building such a massive plane?
It's not to carry passengers, but rather rockets. The bigger the plane, the larger the rockets, or the greater the number.
Allen's Stratolaunch company has partnered with Orbital ATK to "air launch" the Dulles-based company's Pegasus XL, a rocket capable of delivering small satellites, weighing as much as 1,000 pounds (454 kg), to orbit.
The rockets would be tethered to the belly of the giant plane, which would fly them aloft, and once at an altitude of 35,000 feet (10.6 km) or so, the rockets would drop and "air launch" to space.
"With airport-style operations and quick turnaround capabilities," the company said it believes "air launch" is a cheaper and more efficient way to get satellites into space than rockets that launch vertically and can be extraordinarily expensive.
For Allen, it's all about LEO, or low Earth orbit. He, and others, such as Richard Branson's Virgin Orbit, are betting that they can reduce the cost of launching small satellites to space.
And that, in turn, will lead to new ways to beam the internet all across the globe, provide better Earth-sensing capabilities and better communication, and open up all sorts of avenues.
"When such access to space is routine, innovation will accelerate in ways beyond what we can currently imagine," Allen said in a statement a year ago.
"That's the thing about new platforms: When they become easily available, convenient and affordable, they attract and enable other visionaries and entrepreneurs to realize more new concepts."
More than a decade ago, Allen had hoped to spark a revolution in space travel when he funded SpaceShipOne, which became the first commercial vehicle to cross the threshold of space.
The project ultimately won the Ansari X Prize, and a US$10 million award. He then licensed the technology to Branson and moved on to other pursuits. But with Stratolaunch, he is back in the space business.
"Thirty years ago, the PC revolution put computing power into the hands of millions and unlocked incalculable human potential," he wrote.
"Twenty years ago, the advent of the Web and the subsequent proliferation of smartphones combined to enable billions of people to surmount the traditional limitations of geography and commerce. Today, expanding access to LEO holds similar revolutionary potential."
In a statement Wednesday, Jean Floyd, Stratolauch's chief executive, said the company would be "actively exploring a broad spectrum of launch vehicles that will enable us to provide more flexibility to customers".
He added: "Over the coming weeks and months, we'll be actively conducting ground and flight line testing at the Mojave Air and Space Port."
"This is a first-of-its-kind aircraft, so we're going to be diligent throughout testing and continue to prioritise the safety of our pilots, crew and staff. Stratolaunch is on track to perform its first launch demonstration as early as 2019."
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