The Sunday Letter · 001
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The universe had a history
Welcome to the first Sunday Letter. We’re glad you’re here.
In this issue, we follow the observations behind a discovery that changed astronomy. Saints and Science is a Catholic publication, and curiosity is welcome here whether you share our faith, are exploring it, or simply enjoy learning how the world works.
Let’s begin with the night sky. It can look like a permanent backdrop to our lives. Yet the universe has a history, and one of the people who helped reveal it was a Belgian priest and physicist, Georges Lemaître.
In 1927, Lemaître connected an expanding model of the universe with galaxy observations. Drawing on measurements by other astronomers, he estimated how quickly it was expanding. He also recognized the uncertainty in the available distances. The achievement grew from both a bold idea and careful attention to its limits.
Four years later, he proposed his “primeval atom” hypothesis, an early step toward Big Bang cosmology. The modern account developed through many researchers’ work and further evidence, including measurements of the cosmic microwave background that support a hot early universe.
Lemaître brought faith and scientific curiosity into the same life. He also resisted using his cosmology as a religious argument. His scientific and religious writings let us follow how he approached those questions and why he kept their arguments distinct.
Our featured story follows the discovery, the people who contributed to it, and the distinction Lemaître drew between a physical explanation and belief in a Creator. You’ll find the historical sources alongside the story.
Read: The priest who helped reveal an expanding universe
One question for the week
Where has learning more about the natural world deepened or complicated your sense of wonder?
Bring your answer to the article’s comments. A question, a disagreement, or a small observation is welcome. New comments are reviewed before they appear.
With curiosity,
Saints and Science