NASA is headed back to Mars! The InSight spacecraft is scheduled to rocket away from Vandenberg Air Force Base early Saturday morning. Live coverage of the countdown and launch of an Atlas 5 rocket from Vandenberg Air Force Base in California with NASA’s InSight lander heading to Mars to study the red planet’s interior structure. Saturday’s launch is just the first step in InSight’s voyage to Mars. Launching a probe to another planet is not routine, but most scientists will have more butterflies when InSight approaches its destination late this year. Asked whether he will be more nervous during InSight’s...