Space journalist Charles Fishman tells us how the Apollo 11 moonwalk became reality. Then Alan Stern, the head of NASA's New Horizons mission, tells us about their probe's fly-by of Pluto earlier this year. And astronaut Chris Hadfield describes the views of Earth from the International Space Station.

• Planetary scientist Alan Stern, lead for NASA's New Horizons project, and co-author of "Chasing New Horizons" (Picador)
• Journalist Charles Fishman, author of "One Giant Leap" (Simon and Schuster)
• Astronaut Chris Hadfield, Commander of International Space Station Expedition 35, and author of "You Are Here" and "An Astronaut's Guide to Life on Earth" (Little, Brown and Co.)
• Gene Openshaw, co-author of "Rick Steves Europe 101"

• Alan Stern is the head of the New Horizons space mission, exploring Pluto and beyond into the Kuiper Belt. He's co-authored "Chasing New Horizons" to describe the work that has gone into making the mission happen.
• Journalist Charles Fishman wrote "One Giant Leap" about the work and people that made the Apollo Eleven moon mission happen. He summarizes their work in the June 2019 Smithsonian magazine.
• Chris Hadfield's photo book of earth scenes from the International Space Station is called "You Are Here," and is published by Little, Brown and Company. It is available from the ChrisHadfield.ca website.  His latest title is a children's picture book about encountering the unknown, called "The Darkest Dark."
• Colonel Hadfield's videos are included on his You Tube channel.
• NASA provides live photos of the view of Earth from the ultimate window seat on the International Space Station.