In this episode, we pull back the curtain on Lambda CDM, the "guiding star" of modern cosmology. For over two decades, this framework has served as our most reliable map for understanding the universe’s 14-billion-year history, from the first fraction of a second to the accelerating expansion of today.
Despite its triumphs, Lambda CDM isn't perfect. We still don't know what dark matter is, why dark energy has the value it does, or why local measurements of expansion disagree with early-universe calculations—a mystery known as the Hubble Tension.
Until a challenger emerges that fits the data better, Lambda CDM remains our most coherent storyline of how we arrived at a universe full of stars, planets, and us.
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