Drift through a field of distant stars and galaxies, each point of light a sun or an entire island universe. This is the true scale of everything, and our small luminous place within it. Save this for the next time the day feels too big.
When you gaze at the night sky, you are looking backward through time itself. Every star you see is actually ancient light, already on its journey for years, centuries, or millennia before it reaches your eyes. The nearest star beyond our Sun, Proxima Centauri, is so distant that its light takes over four years to reach Earth. This means that when you observe it tonight, you are witnessing photons that began their voyage in 2020. The farther we look, the farther back we journey into the past. This simple fact opens a window into how the universe was billions of years ago, long before Earth existed.
Our home galaxy, the Milky Way, is a spiral island of roughly 200 to 400 billion stars, all held together by gravity in a rotating disk. We live in one of its outer spiral arms, unremarkable in position but home to everything we have ever known. For most of human history, people had no idea the Milky Way was a galaxy at all. They saw it as a pale river of light across the sky, a phenomenon they incorporated into their mythologies and stories. It was only in the early twentieth century that astronomers understood the true nature of this structure through increasingly powerful telescopes and careful observations of stellar distances.
Beyond the Milky Way lies an almost incomprehensible abundance of other galaxies. Current understanding suggests there are roughly 100 billion galaxies in the observable universe, each containing millions or billions of stars. These galaxies take on many shapes: some are spiral like ours, others are elliptical clouds of stars, and some appear completely irregular. They are scattered throughout space at distances so vast that light itself takes millions of years to travel between them. A single galaxy might span 100,000 light years across, yet from our vantage point appear as little more than a faint smudge.
The expansion of space itself is perhaps the most humbling discovery of modern astronomy. The universe is not static. It is expanding in all directions, stretching the space between galaxies constantly and without bound. This expansion was discovered in the 1920s when astronomers realized that distant galaxies showed a shift in their light toward the red end of the spectrum, indicating they were moving away from us. The farther the galaxy, the faster it recedes. This means there is no center to the universe. From any galaxy's perspective, all others appear to be moving away. We are not at the edge or the middle. We are everywhere and nowhere in particular.
Between the islands of galaxies lies mostly empty space, but this emptiness is not truly void. Space itself is woven with gravity and mysterious dark matter and dark energy that we still only partially understand. Dark matter, invisible to telescopes, appears to make up the vast majority of all matter in the cosmos. Dark energy, even more enigmatic, seems to be accelerating the expansion of space itself. These invisible components are revealed to us only through their gravitational effects on the light and motion of visible matter.
When you understand these scales and this architecture, daily concerns take on a different character. Not because they become unimportant, but because they become contextualized within a framework so much larger and older than any single life. The light from distant galaxies has been traveling for billions of years to reach your eyes in this moment. You are made of atoms forged in the hearts of ancient stars that exploded long ago. The iron in your blood, the carbon in your cells, the calcium in your bones, all came from stellar furnaces now long extinct. You are not separate from the cosmos. You are a temporary arrangement of its oldest and most fundamental materials, briefly conscious within an expanding universe of incomprehensible scale.
Watch on Yesodi → Join Yesodi →