UNITED NATIONS (AP) -- A scientists' group on Thursday warned the United States against weaponizing space, saying the move would be prohibitively expensive and could set off a new arms race. The Union of Concerned Scientists, a watchdog group that opposes weapons in space, said the United Nations should consider drafting a treaty that would prohibit interfering with unarmed satellites, taking away any justification for putting weapons in space to protect them. "The United States has a huge lead in the space field -- it can afford to try out the multilateral approach,'' said Jonathan Dean, a former U.S. ambassador...