Former astronaut Buzz Aldrin and his wife Lois, waves to the crowd after making the ceremonial first walk Tuesday afternoon, March, 20, 2007, on the glass-bottomed Grand Canyon Skywalk located at Grand Canyon West’s Eagle Point in Arizona. Indian leaders, former astronauts and other visitors stepped gingerly beyond the Grand Canyon’s rim Tuesday, staring through a glass floor and into the 4,000-foot chasm below during the opening ceremony for a new observation deck. (AP Photo/The Arizona Republic, Rob Schumacher) ** MARICOPA COUNTY OUT, MESA TRIBUNE OUT, MAGS OUT, NO SALES **