Fifty years ago, the Apollo 17 Saturn V moon rocket launched into space. On its trip to the moon, the crew took what would become one of the most iconic images from space: a photo of planet Earth — “the blue marble.” The image captured the imagination of Mae Jemison who would eventually become an astronaut herself; the first woman of color to travel into space as a mission specialist on board the Space Shuttle Endeavour in 1992. These days, Dr. Jemison leads the 100-Year Starship Project, a nonprofit whose hope is interstellar travel within 100 years. She speaks to host Marco Werman.