Microsoft co-founder Paul Allen has spent the last six years working on a giant aircraft capable of launching rockets to space. Today, his company Stratolaunch Systems literally rolled that plane out of its hangar in the Mojave Desert for the first time ever.

A soldier stands guard on the aircraft park of the Pyongyang Airport on April 3, 2011 in Pyongyang, North Korea. Pyongyang is the capital city of North Korea and the population is about 2,500,000.

Models walks the runway at the Stephan Pelger Show during Mercedes-Benz Fashion Week Berlin Spring/Summer 2012 at the Brandenburg Gate on July 9, 2011 in Berlin, Germany. (Photo by Gareth Cattermole/Getty Images for IMG)

Bullfighter Julian Lopez “El Juli” of Spain performs during the second bullfight of the 2011 season at the Monumental bullring on July 10, 2011 in Barcelona, Spain. This will be the last year for Bull fighting at the Monumental bullring as the parliament of Catalonia has voted to ban bullfighting as of January 1, 2012. (Photo by David Ramos/Getty Images)

People help a woman overwhelmed by emotion and the heat during the mass funeral, attended by tens of thousands of mourners, of 613 coffins of newly-identified victims of the 1995 Srebrenica massacre at the Potocari cemetery and memorial near Srebrenica on July 11, 2011 in Potocari, Bosnia and Herzegovina. (Photo by Sean Gallup/Getty Images)

A prototype battery-powered plane, called Greased Lightning or GL-10 is pictured flying at NASA's Langley Research Center in this undated handout photo obtained by Reuters May 1, 2015. The plane, which has 10 engines and can take off like a helicopter and fly efficiently like an aircraft, is currently in the design and testing phase. (Photo by Reuters/NASA)

People take pictures as an Airbus Beluga XL transport plane lands during its first flight event in Colomiers near Toulouse, France, July 19, 2018. The Beluga XL, the new cargo plane of the Airbus family has taken off from Blagnac, in the south of France, for its first test flight. The launch of the aircraft triggered thunderous applause in an audience of more than 10,000 people, mostly employees and subcontractors of the European aircraft manufacturer. (Photo by Regis Duvignau/Reuters)

An aircraft drops water during a wildfire near Olympia town, western Greece, Thursday, August 5, 2021. Wildfires rekindled outside Athens and forced more evacuations around southern Greece Thursday as weather conditions worsened and firefighters in a round-the-clock battle stopped the flames just outside the birthplace of the ancient Olympics. (Photo by Giannis Spyrounis/ilialive.gr via AP Photo)