Four astronauts embarked on a high-stakes flight around the moon Wednesday. It marks humanity’s first lunar voyage in more than half a century and the thrilling leadoff in NASA’s push toward a landing in two years. Carrying three Americans and one Canadian, the 32-story rocket rose from NASA’s Kennedy Space Center where tens of thousands gathered to witness the dawn of this new era. Five minutes into the flight, Commander Reid Wiseman saw the team’s target: “We have a beautiful moonrise, we’re headed right at it,” he said from the capsule.