AP - U.S. space agency NASA plans to launch several massive helium balloons from a northern Sweden launch pad this summer, officials said Wednesday.{br}{br}View the Entire Article (http://us.rd.yahoo.com/dailynews/rss/science/*http://story.news.yahoo.com/news?tmpl=story2&u=/ap/20050216/ap_on_sc/sweden_nasa){br}