WASHINGTON: Nasa and private sector experts now agree that a man or woman could be sent on a mission to Mars over the next 20 years, despite huge challenges.

The biggest names in space exploration, among them top officials from the US space agency and Buzz Aldrin, the second man to walk on the moon, will discuss the latest projects at a three-day conference starting on Monday in the US capital.

Renewed interest in the red planet has triggered the launch of several initiatives in recent months, including one proposing a simple one-way trip to cut costs.

The American public also favours sending astronauts to Mars, according to a survey by non-profit group Explore Mars and aerospace giant Boeing.

The poll in March of more than a thousand people published in March found that 71pc of Americans expect that humans will land on Mars by 2033.

Seventy-five per cent say Nasa’s budget should be doubled to one per cent of the federal budget to fund a mission to Mars and other initiatives.

Nasa receives only 0.5pc of the US federal budget, compared to four per cent during the Apollo project to conquer the moon in the 1960s.

The US space agency’s chief Charles Bolden has stressed that “a human mission to Mars is a priority.” But the US financial crisis is a major obstacle to such a project. “If we started today, it’s possible to land on Mars in 20 years,” said G. Scott Hubbard of Stanford University.

“It doesn’t require miracles, it requires money and a plan to address the technological engineering challenges,” added Hubbard, who served as Nasa’s first Mars programme director and successfully restructured the entire Mars programme in the wake of mission failures.

Placing a mass of 30-40 tonnes — the amount estimated to be necessary to make a habitat on the red planet — would be one of the greatest challenges, along with the well-known problem of carrying or producing enough fuel to get back, Hubbard stressed.

The Curiosity rover took a nail-biting seven minutes in August to make its descent on Mars. But it only weighed one tonne.

The $2.5 billion Curiosity mission, which is set to last at least two years, aims to study the Martian environment and to hunt for evidence of water in preparation for a possible future manned mission.

Robotic missions will therefore be necessary to prove the system works before scientists can even contemplate sending humans aboard.

Nasa is developing a Space Launch System and the Orion capsule for distant space exploration.

Hubbard said a nuclear engine should be developed for any vehicle headed to Mars because it would provide a continuous thrust and thus reduce travel time by about three months, as well as reduce the risk of radiation.

In addition to the technological challenges, the negative impact of long space journeys on the human body are not yet well known, especially with respect to cosmic radiation. Davison said scientists need a “minimum” of 10 years to complete research about the trip’s impact on the human body before going to Mars.—AFP