BOSTON (AP) – Talk about a runner’s high. Suni Williams will be out of this world when she runs the Boston Marathon next month. The US Navy commander is an astronaut who’s now aboard the international space station, orbiting more than 200 miles above the Earth. She’s registered to compete in the famed marathon. But instead of pounding Boston’s pavement, Williams will run an equivalent distance on the space station’s treadmill. She’ll be held down by bungee cords so she doesn’t float away in the zero-gravity environment. It’s not the first time the marathon has had far-flung participants. For three-years running, organizers have sponsored the “Boston Marathon in Iraq” for GIs in the war zone.