OSIRIS-REx is NASA's first mission to visit an asteroid and return a sample of material to Earth. Yesterday marked the beginning of the seven-year long endeavor, with the uphill ride provided by the venerable Atlas V rocket.
Atlas standing ready the day before launch. Note the single solid booster on the vehicle. The rarely-flown and very asymmetric 411 configuration was chosen for this mission.
Bill Nye taking questions from the media. The Planetary Society, for which Nye is CEO, collected names and artwork to fly (in digital form) on the spacecraft.