Four distinguished astronomers reunite to commemorate five decades of collaboration and camaraderie by embarking on a nostalgic road trip through the southwestern United States. During their journey, they reminisce about their youthful escapades and discuss the significant impact they have had on one another during one of the most thrilling eras in the history of astronomy. Roger, the instrument-maker; Donald, the theoretician; Nick, the visionary; and Wal, the observer, collectively symbolize the most fruitful period in the field. They played pivotal roles in constructing the largest observatories on the planet and made groundbreaking discoveries about the universe’s evolution, which have the potential to transform humanity’s self-perception. Alison Rose’s film offers a humorous, insightful, and intimate exploration of friendship, as these men contemplate how their profound contributions to understanding the universe have influenced their personal beliefs, including their views on religious faith, life’s purpose, and the boundaries of what can be known.