The dawn of a new space age?

Why is the shuttle being scrapped?

Building, operating and testing America's space shuttles has cost around $290bn over the course of the 30-year programme, a huge proportion of the National Aeronautics and Space Administration (Nasa) budget. Critics question its value for money, particularly given the state of America's finances. Over the past two decades robots have flown around Jupiter and Saturn, rovers have explored Mars, and the Hubble telescope has captured extraordinary images, but the accomplishments of the shuttle have been harder to quantify. The excitement of the Apollo moon landing has never been repeated and the losses of Columbia and Challenger, along with 14 astronauts, dented the public's confidence in Nasa.

So what will Nasa do?

Nasa's funding is being cut by $1.6bn to $16.8bn. Over the next five years Nasa is planning to produce a heavy-lift rocket that could travel further into space. Cutting the shuttle should allow it to focus on unmanned, long-distance exploration trips, to an asteroid by 2025, and possibly to Mars. But a lack of manned craft means Nasa will have to hitch a ride aboard Russia's Soyuz and Progress vehicles at a cost of $63m a ticket to supply the International Space Station (ISS). To encourage private firms to fill the gap, Nasa is providing $6bn of funding. Current recipients include Blue Origin, Boeing, Sierra Corp and SpaceX all of which hope to sell astronaut taxi' services within five years. This marks a radical change in approach. Ever since the Soviet Union put a Sputnik satellite into space in 1957, space exploration has almost exclusively been the preserve of governments. American multi-millionaire Dennis Tito marked a turning point in 2001 when he paid a reported $20m to become the first space tourist and spent seven days in orbit as a guest of the Russian Federal Space Agency. Since then, Space Adventures has organised another seven flights to the ISS.

Is there money to be made?

Yes, although the costs of putting a spaceship into orbit are huge (see below). According to Nasa, GPS systems, the artificial heart, robotic limbs and cochlear implants are just a few of the 1,600-plus computing and medical innovations derived directly from the space programme. Companies subcontracted by Nasa are already making big money from logistical missions to the ISS and from servicing satellites. There are plenty of other potential gold mines too. Zero-gravity and the vacuum environment of space could make orbital labs and manufacturing attractive: Nasa has already used zero gravity to produce perfectly calibrated spheres for ballbearings, and new substances, particularly alloys that cannot be made on earth, could be created. The moon contains helium-3, a potentially rich source of energy through nuclear fusion. But the most immediate money-making opportunity lies in space tourism.

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At $20m a flight?

No. Tito travelled to the ISS and spent a week in orbit. The first space tourists will make a sub-orbital flight, allowing them to experience a few minutes of weightlessness, see the curvature of the earth and stare into the blackness of space before returning to Earth. The best-known company, Virgin Galactic, expects its first commercial flights to take place in 2013 following a successful test flight of its SpaceShipTwo last year: 430 people have already signed up, at $200,000 a head. Other companies, including XCOR and Blue Origin, are working on sub-orbital tourism vehicles. Billionaire Robert Bigelow has perfected a design for inflatable space hotels. He says the only thing holding his firm back is the transport system for his potential customers.

What about flights into orbit?

Costs are the biggest problem. These will remain high until someone develops a rocket-powered aircraft capable of multiple take-offs, which is likely to take many years. SpaceX, however, the first private firm successfully to return a spacecraft from orbit, managed to do so with costs that are seen as little short of miraculous within Nasa. The firm has already signed a fixed-price contract with Nasa to run 12 cargo flights to the ISS at an average price of $133m. Orbital Sciences Corporation, its chief rival (see below), is well on its way to developing its own rocket.

Any competition from foreign governments?

Space race leadership has been seen as a symbol of national potency ever since the moon landings, and there are fears that China could overtake the US. In 2003, China became the third country to send an astronaut into space on its own. Its space station is due to open around 2020, just as the ISS is to close. If America and its 13 partners don't come up with a replacement, China could have the only permanent human presence in space.

How to invest in space exploration

The cost of putting a spacecraft into orbit hardly makes for a convincing business plan. As Stephen Fleming of private equity firm EGL Ventures puts it, imagine trying to run a business with $37 stamps, $1,500 envelopes and petrol at $200/gallon. "No wonder Wall Street isn't interested." So it's no coincidence the major players in the sector are backed by wealthy private individuals. The man behind SpaceX, Paypal founder Elon Musk, is worth $500m; Blue Origin's backer, Jeff Bezos, is worth $18bn. However, there are a number of listed companies you could consider. Both Boeing and Lockheed Martin are making money from space through contract work for Nasa. A purer play is Orbital Sciences. It designs rockets and makes satellites for various industries and has a contract with Nasa to deliver cargo to and from the ISS.