NEW YORK - The development and deployment of space-based weapons by the U.S. military will not only encourage other nations to do the same, but leave vital non-weapon spacecraft vulnerable to attack, according to one weapons expert.

Physicist Richard Garwin, a nuclear weapons expert who has studied the U.S. military's plans for space-based systems, said that while protecting space assets is key, devoted weapons platforms could be easily destroyed by enemies with cheaper, mine-like microsatellites.

Instead, Garwin proposed the development of a formal treaty among nations banning space weapons and anti-satellite spacecraft to draw lines across what type of weaponry - if any - is internationally acceptable in space.

"I think that we need to have these formal agreements in order that we understand what is legitimate, and that other countries understand what is not legitimate," Garwin told researchers, professors and students in a packed auditorium at Polytechnic University in Brooklyn. "They could therefore be punished not by tit-for-tat against their satellites, but against their military capabilities on the ground."

The U.S. Air Force has outlined a series of potential space weapons initiatives in its Transformation Flight Plan, a 176-report released publicly earlier this year. Included in the report are discussions over space-based lasers, hypervelocity rod bundles that can rain down on targets from space, as well as new air and spaceworthy vehicles.

"Space superiority is as much about protecting our space assets as it about preparing to counter an enemy's space or anti-space assets," said General John Jumper, chief of Staff for the U.S. Air Force, in an Aug. 2 report on Counterspace Operations. "The United States relies on space operations for its security, and this reliance may make us vulnerable in some areas."