NASA will celebrate the 30th anniversary of the Human Exploration Rover Challenge when the competition returns to the U.S. Space & Rocket Center’s Aviation Challenge Course in Huntsville, Alabama, Friday, April 19, and Saturday, April 20. The event is free and open to the public with rover excursions occurring each day from 7:30 a.m. to 3 p.m. CDT or until the last rover completes the obstacle course. NASA selected 72 student teams in October to begin an engineering design challenge to build human-powered rovers that will compete at the course near the agency’s Marshall Space Flight Center. Me…