Hitchens is calling for a code of conduct between nations operating in space, despite the aversion of US President George W. Bush's administration for international treaties.

The code-of-conduct approach "is feasible when mutual interests are defined," she explained at a conference organized by the George Marshall Institute in Washington this week.

The Outer Space Treaty, in force since 1967, bans only nuclear arms and other weapons of mass destruction in space.

Since the 1960s, more and more nations have operations in space and today 41 countries have satellites orbiting Earth, Hitchens said.

The United States's superiority in space is currently unequalled but China could threaten it in the coming years, she said.

Bush last year adopted a new space strategy, which some say is highly unilateralist. The policy declares freedom of action by the United States, giving Washington the right to bar from space, if necessary, any country hostile to US interests and to reject any treaty forbidding arms in space.

"A code of conduct can increase freedom of action for responsible actors by restricting harmful actions and behaviors," Hitchens said.

For proof she points to the question of space debris, an issue that has resulted in consensus to limit such debris in satellite launches.

But other American experts oppose regulation and argue that US superiority in space should not be shackled in the face of the Chinese threat. Their concern has been bolstered by the fact that the US military in increasingly dependent on satellites for combat operations.

"The United States must be prepared to defend its sovereign rights by any means necessary," said Baker Spring, an expert at the Heritage Foundation think tank.

He said the US government "should use its diplomatic strength to convince its allies to support in principle the use of military force to counter attempts to deny any state these rights of passage" in space.

Jeff Kueter, the president of the George Marshall Institute, said the United States "should reject any international agreement that would further restrict the use of space to protect national security satellites."

Kueter dismissed diplomatic approaches, such as adoption of a multilateral code of conduct, as "largely camouflage for unverifiable arms control agreements."

"Absent the ability to enforce compliance or punish offenders, a code-of-conduct rule regime may be weak and, more likely than not, ineffectual," he said.

Philip Meek, associate general counsel and director of space law for the US Air Force General Counsel, expressed concern about the idea of international treaty negotiations.

"What is going to be the objective of the other nations in any kind of arms control? The objective is going to bring the United States down to their level," he said.

Meeks said an "informal cooperation" already exists between countries in space. "The issue is how formalized it should be," he said.

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