“It has been nearly 40 years since Alan L. Bean walked on the moon as an Apollo astronaut, but he still wrestles with the experience every day, trying to recapture what he and other astronauts saw and felt in the medium of paint. … ‘When I left NASA, I made up my mind I was not going to be an astronaut who painted, but an artist who used to be an astronaut,’ he said. ‘It takes a while to change the heart.'”