You may now float about the cabin

'SPACE: The final frontier, to seek out new life and civilisations." So said Captain James T. Kirk of the Starship Enterprise as he surveyed the expanding cosmos.

But exploration, discovery and adventure are not the sole domain of science fiction: they have always been defining elements of the human psyche.

Once mankind satisfied the lesser, more fundamental requirements such as food, shelter and community, we looked beyond the horizon and wondered, "What if?"

Sure, it took thousands of years for our sluggish and humble species to progress from canoes to steamships, yet much less than one hundred to go from powered flight to space travel.

From a traveller's perspective, now is the most exciting time in our species' existence.

Such have been the astounding technological advances that, in one lifetime, man has flown to the moon and now transverses every continent at an altitude of 30,000ft in the company of hundreds of others, enjoying the latest movies and gourmet meals in pressurised comfort. To many, it's even mundane.

Space travel fell somewhat flat after the Apollo program. Many pundits, such as sci-fi writer Arthur C. Clarke, predicted we'd be sticking flags in Mars and holidaying on the moon by now.

Somewhere along the way we were sidetracked – probably because our expensive, clumsy rockets weren't as reliable as we'd hoped. This is World War II technology, after all.

Riding what amounts to a ballistic missile still hasn't deterred some, despite a pricetag equivalent to the GDP of a small African republic.

At time of writing, there have been five "spaceflight participants" aboard the Russian Soyuz craft, each traveller paying a reported $20 million for the week-long joy ride to the International Space Station (ISS).

Tickets are now being sold for a planned flight to orbit the moon. Price? $100 million each.

Affordable space flight? Enter the X PRIZE Foundation, a non-profit body offering multi-million dollar awards for technological breakthroughs. The 2004 Ansari X PRIZE was won by famed aerospace designer Burt Rutan and financier Paul Allen, who led the first private team to build and launch a spacecraft capable of carrying three people 100km above the Earth. Pounced upon by Virgin supremo Sir Richard Branson, commercial flights are now tantalisingly close.

Branson's Virgin Galactic spaceline expects to launch about 500 passengers annually.

His proposed fleet of five spaceships will have a crew of two and just six passengers, paying US$200,000 ($215,000) each, flying to an altitude of about 110km – the very edge of space – to experience almost 10 minutes of weightlessness.

Unlike NASA's Space Shuttle, which uses huge and dangerous solid fuel rocket boosters, Virgin Galactic's SpaceShipTwo will launch from a jet-powered mother ship called WhiteKnightTwo, and use a single hybrid rocket motor to reach its peak sub-orbital altitude. And because the craft will only travel at around 4000km/h, it will not require heatshields for re-entry.

Branson appointed "space agents" last year, and Gil McLachlan of Harvey World Travel in Manly is one.

"There are at least 10 Australians fully paid up for the flight," said Mr McLachlan, "and there will be more in the next 12 months, for sure."

One such passenger eagerly awaiting his moment on the launch pad is Wilson da Silva, editor of Australian science magazine Cosmos, whose ticket was one of four bought by Dr Alan Finkel, the publication's chairman.

"Hard to believe that it's really going to happen," says da Silva with obvious delight. "It's been a dream of mine since I was a kid."

In Clarke's seminal 1968 work 2001: A Space Odyssey, Dr Heywood Floyd settles into the Orbiter Hilton for a family video call at a rather clunky terminal.

The choice of the Hilton name for that movie was no coincidence; it was a carefully engineered piece of product placement. William Barron Hilton I, the hotelier and grandfather of the famous Hilton sisters, bravely predicted in 1967: "When space scientists make it physically feasible to establish hotels in space and to transport people, the hotel industry will meet the challenge."

Beyond an orbiting hotel, his plans extended to the Lunar Hilton. "To start, we'll have only three floors, which will eliminate elevators and minimise power requirements," he said.

"The multi-storied underground hotel will come later.

"But – and this is very important – in almost every respect the Lunar Hilton will be physically like an Earth Hilton."

But Hilton appears to have lost the inside running to Branson and Robert T. Bigelow, a rival hotelier who is now an aerospace magnate. His Genesis modules are already in space, testing the concept of inflatable habitats for possible "hotel" adaptation.

For most of us reading this far, the reality of space flight will remain a fantasy, experienced vicariously in the Sensurround stadium of the cinema.

But the excitement of weightlessness can be achieved at Kennedy Space Centre, in Florida, on a Zero Gravity flight aboard G-Force One, the plane used to train NASA astronauts and film star Tom Hanks for Apollo 13. For $3500, you even get a DVD of your flight. I predict, however, that theme park, holodeck-style virtual reality will cater for the masses long before actual space flight does.

After all, it was to such a synthetic environment that Star Trek creator Gene Roddenberry's homesick space adventurers went to "get away from it all".

As for the visionary Roddenberry ... his one-way trip into space was in an urn.

The Sunday Telegraph