CAPE CANAVERAL, Fla. (AP) — By NASA's calculations, we've made it to Pluto. The moment of closest approach for the New Horizons spacecraft came at 6:49 a.m. CDT Tuesday. It culminated an unprecedented journey spanning 9½ years and 3 billion miles. Based on everything NASA knows, New Horizons was straight on course for the historic encounter, sweeping within 7,800 miles of Pluto at 31,000 mph. But official confirmation won't come until later tonight (TUE), several nerve-racking hours later. That's because NASA wants New Horizons taking pictures of Pluto, its jumbo moon Charon and its four little moons during this critical time, not gabbing to Earth. NASA marked the moment live on TV, broadcasting from flight operations in Maryland. The United States is now the only nation to visit every single planet in the solar system. Pluto was No. 9 in the lineup when New Horizons departed Cape Canaveral, Florida, in 2006 to shed light on the mysterious icy world, but was demoted seven months later to "dwarf planet" status. Pluto was discovered in 1930 by Clyde Tombaugh, a 24-year-old Kansas farmer, who was working as a paid intern at the Lowell Observatory in Flagstaff, Arizona. His discovery earned him international fame and a college scholarship to the University of Kansas, where he completed two degrees.