Q&A with Scott Bolton, principal investigator on NASA’s Juno mission

What began as a concept scribbled on a cocktail napkin in a Tucson bar 12 years ago — sending a spacecraft to an asteroid and retrieving a pristine sample to bring back to Earth for study — becomes reality Thursday with the launch of NASA’s OSIRIS-REx mission.

A robotic lander and rover lifted off Friday (U.S. time) from China’s Xichang space center, kicking off a journey that will culminate in an attempt in early January to touch down on the far side of the moon for the first time.

The U.S. Air Force’s next GPS navigation satellite met its ride into space this week with the spacecraft’s bolting on top of a United Launch Alliance Delta 4 rocket at Cape Canaveral in preparation for liftoff Aug. 22.