U.S. stocks gain ground as SpaceX debuts

NEW YORK, June 12 (Xinhua) -- U.S. stocks closed higher on Friday, bolstered by positive developments surrounding U.S.-Iran negotiations and a jump of SpaceX shares in the highly anticipated debut. The Dow Jones Industrial Average rose 353.51 points, or 0.7 percent, to 51,202.26. The S&P 500 added 37.16 points, or 0.5 percent, to 7,431.46. The Nasdaq...