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.

Space shuttle Atlantis launches from pad 39A on July 8, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Florida. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. (Photo by Bill Ingalls/NASA via Getty Images)

Coffins are lined up near the wreckage of the bus, on July 29, 2013. (Photo by Salvatore Laporta/Associated Press)

The cruise ship Costa Concordia lies stricken off the shore of the island of Giglio, on January 14, 2012 in Giglio Porto, Italy. More than four thousand people were on board when the ship hit a sandbank. At least 3 people have been confirmed dead and another 50 are unaccounted for. (Photo by Laura Lezza/Getty Images)

Workers use a boat to recover supplies from a flooded grain elevator May 4, 2011 in Caruthersville, Missouri. Heavy rains have left the ground saturated, rivers swollen, and has caused widespread flooding in Missouri, Illinois, Kentucky and Arkansas. (Photo by Scott Olson/Getty Images)

Nelson Mandela make up complete. 40-year-old London-based makeup artist, Maria Malone-Guerbaa has the ability to transform herself into any celebrity or creature using only her basic makeup essentials. Maria used only make up and face paints to create the illusion of Nelson Mandela, Britain's Queen Elizabeth II, and many other A-list celebrities. (Photo by Maria Malone-Guerbaa/Rex Features USA)

Emergency services work at the scene of a bus accident on the Kingsway in central London February 2, 2015. A number 91 double-decker bus had its roof ripped off after hitting a tree, causing injury to passengers and passers-by, local media reported. (Photo by Peter Nicholls/Reuters)

A gannet grabs a fish by its beak, 2014, in Shetland, Scotland. Hundreds of gannets crash into the sea in search of food – leaving a trail of air bubbles in their wake. Richard Shucksmith, 41, on the Shetland Isles, Scotland captured the remarkable scene as he took a boat to feed the large colony of seabirds that nested on the cliffs. The photographer has taken images of the gannets every summer for the last three years as the birds gather on the cliffs to breed. (Photo by Richard Shucksmith/Barcroft media)