A day after three former astronauts derided President Obama’s space policy, the White House is firing back. In an email sent Wednesday afternoon from the White House press office, Apollo 11 astronaut Buzz Aldrin applauded the president’s “boldness” and changes to NASA’s human spaceflight missions. “I believe that this is the right program at the right time, and I hope that NASA and our dedicated space community will embrace this new direction as much as I do,” he said in a statement. “By so doing we can together continue to use space exploration to help drive prosperity and innovation right...