US astronauts who walked on the moon – Buzz Aldrin, Charlie Duke & Harrison Schmitt – re-unite in front of an audience as part of the Starmus IV festival in Trondheim, Norway to take part in a debate titled “To the Moon and Beyond.” The three speakers are expected to share their views on space exploration and future missions to Mars. The Starmus International Festival is an international gathering focused on celebrating astronomy, space exploration, and related sciences. It is being held June 18-23.