Flights on the Russian aircraft have attracted passengers ranging from scientists to zero-gravity dancers.

ECONOMIST: Space tourism

In the zero-gravity void of interstellar space, the crafts might survive indefinitely, traveling the universe for all eternity.

FORBES: Greetings From Earth

Living in a zero-gravity environment poses risk of nutrient deficiency and bone loss, so keeping close tabs on food intake in space is crucial.

FORBES: NASA Asks The 'Crowd' To Help Track What Astronauts Eat

The four current NASA pilots who can operate the modified 747 are ex-military aviators who split their time flying other planes including zero-gravity aircraft and T-38 supersonic jets.

MSN: What it's like to fly a plane carrying shuttle - Technology & science - Space | NBC News

Mohamed was announced as a regional finalist and after a week of public voting was invited to Washington DC as a regional winner to experience a zero-gravity flight.

CNN: Can jumping spiders kill in space? Student's experiment set for orbit

Second place gets a free zero-gravity plane flight.

FORBES: Virgin's Top Frequent Flier Gets To Fly For Free - Into Space

It carries six passengers and two pilots, with nothing but identical window seats and transparent roof panels, since you will have the option of unbuckling and floating around the cabin during the zero-gravity portion of the flight.

FORBES: Out Of This World: Space, The Final Frontier

Within that green box is a microplate reader, a workhorse appliance in labs on Earth but the first of its kind to work in the near-zero gravity at 250 miles up.

FORBES: Doing Science In Zero-G? You'll Have To Go Through Nanoracks

Created by long-time base jumper and skydiver, Ossie Khan, and shot over a two-year period, Experience Zero Gravity reveals some of the most stunning base jumping locations in Europe.

BBC: Base jumping: The serene side we��ve never seen

Virgin Galactic is aiming for the winged, minivan-sized SpaceShipTwo to rocket tourists into zero gravity in two or three years, Branson said in December.

FORBES: Magazine Article