In almost 20 years of research, it has been the home of some of the most daring ideas to aid exploration: space elevators, crops that could grow on Mars and a shield to protect our planet from global warming.

But now, NASA's Institute for Advanced Concepts (NIAC) has fallen victim to a very down-to-earth problem - a lack of money.

The US space agency is set to close its futuristic ideas factory as part of a cost-cutting exercise which it hopes will help pay for ambitious plans to explore the moon and Mars.

Bobby Mitchell, who works at NIAC's headquarters in Atlanta, said: "From what I understand, NASA are out of money. We haven't got an official notice yet but we have heard from NASA that they are going to discontinue funding."

Former NASA scientist Keith Cowing said the decision to close NIAC was "just plain stupid".

Writing on his NASA Watch website, he directed comments to NASA's administrator, Mike Griffin: "Advanced spacesuits ... will open the surface of the moon - and then Mars - to meaningful and productive human exploration. Where are you going to get all of the things you need to put on those Ares rockets so as to allow their crews to carry out their missions, Mike? Or do you 'just need a good map'? Explorers without the right tools die - or turn around - and head back home. Wrong answer, Mike."

NIAC was set up in 1988 as a way to brainstorm revolutionary ideas that go beyond anything NASA does today. It draws $4 million every year from the agency's $16 billion budget and funds about a dozen projects every year for long-term ideas, things that could come to fruition within 10 to 40 years.

The institute is most interested in grand visions and big ideas that might inspire new technologies and scientists have traditionally been told they should not feel encumbered by what is possible today. Ideas where the technology to make something work has not yet been developed or the science is not entirely understood are welcomed.

Despite this wide remit, NIAC has kickstarted several ideas that have subsequently been picked up for further development by NASA. Most recently, NASA got interested in a project called the New Worlds Imager, a space probe designed to take pictures of planets outside our solar system.

Many of NIAC's projects fall into the realm of science fiction. The institute is famously home to the space elevator, an idea first proposed by Arthur C Clarke in his 1978 novel Fountains of Paradise, to transport people and equipment cheaply into space.

In the NIAC proposal, a cable would be attached from the ground to a satellite in geostationary orbit around the Earth. Vehicles could then climb the tether and escape gravity without the need for rockets. But no one has yet designed materials that would be strong enough for the elevator to work.

Roger Angel of the University of Arizona was recently funded to look into creating a 2,000-km-wide shield to protect the Earth from the sun's rays and counteract global warming. "Such a space-based solution might become an urgent priority, worth trillions of dollars if abrupt climate failures appear otherwise inevitable," he wrote in the outline for this project.

"We propose to identify near-term research and space missions needed to understand whether a shield could be completed within a few decades at an affordable cost."

Source: China Daily/agencies