We watched YouTube, ate salad by his pool, and talked for several hours about art and love ... That Carl Sagan thing, the “pale blue dot,” have you ever seen that? It’s so beautiful.

The obvious answer is “yes!” So then, how will we preserve it? In 1994, the astrophysicist, author, and TV presenter Carl Sagan wrote the “Pale Blue Dot,” a book inspired by and discussing the intense ...