COLUMBIA, S.C. (AP) — Fifty years after his Apollo 16 mission to the moon, retired NASA astronaut Charlie Duke says he’s ready for the U.S. to get back to lunar exploration. Part of that effort, Duke said Friday, will come in the form of the Artemis program, which includes NASA’s upcoming flight to the moon using its new Space Launch System rocket. The first of the huge rockets is supposed to blast off without crew later this year, with crewed flights planned subsequently. “With Artemis, NASA is going to be focused on deep space, to the moon and beyond, and...