There is a small detail in Genesis that often gets skipped, and when you stop on it, it is strange. On the first day light was created: “Let there be light.” Yet the sun, the moon, and the stars — the sources of light we know — appear only on the fourth day. That is, light was here before there were bodies to give it off. A ten-year-old notices this right away and asks: wait, where did the light come from if there was no sun yet?
Where this touches science
The scientific picture of the early universe is interesting here in its own right, with no need to tie it to the text at all. In the first minutes and moments after the Big Bang, the universe was so hot and dense that light — the photons — was trapped. It could not travel freely, because it kept colliding with the charged particles that filled everything. The universe was opaque, like a thick white fog.
When the universe cooled enough, after a few hundred thousand years, the particles joined into stable atoms, and suddenly light had room to travel. It was released. That released light is what we measure today as the cosmic background radiation, the lukewarm echo that fills the whole sky. All of this is established science. And the point that draws attention: this light preceded the stars. The first stars lit up only hundreds of millions of years later. In the cosmic sense, light was indeed in the universe long before there were suns to shine it.
Now, it is important to say this clearly: the parallel between “light before sun” in the verse and “photons before stars” in cosmology is an analogy that we draw today, in hindsight. It is lovely, it is pleasant, and we must not call it more than it is. The text did not forecast and did not predict cosmology. We, who know both things, place them side by side and notice the resemblance. This is an exercise of modern readers, not a prophecy of ancient writers. The moment you blur this difference, you lose the honesty that makes the comparison interesting in the first place.
What tradition offers
The order in Genesis — light first, luminaries afterward — occupied commentators long before there was modern science to compare it to. They felt exactly the same strangeness, and asked: what kind of light is this, that precedes the sun? Some spoke of a different, primordial light, distinct from the light of the stars. This question is ancient, and it was asked out of the text itself, not out of physics.
The idea of light as something primary, almost a foundational principle of reality, belongs to no single tradition. In Christian thought light is tied to creation and revelation. In the Qur’an there is a well-known verse that speaks of God as the light of the heavens and the earth. In Greek thought light and sight were a central image for knowledge and truth. A secular person feels the pull too: we speak of “illuminating” an idea, of “it dawned on me in a flash.” Light as a metaphor for the beginning, for clarity, for a start — that is something that crosses cultures. None of these readings needs to deny the others, and none needs to lean on science in order to stand.
Why it matters
Because here it is especially easy to slip. The temptation to say “look, they knew about the background radiation thousands of years ago” is strong, and it is dangerous exactly to the degree that it is tempting. The moment you say it, you turn a lovely analogy into a false claim, and the text and the science both come out the losers. Keeping the boundary — this is an analogy, not a prophecy — is what allows you to enjoy the resemblance with a whole heart.
And there is also here a human question older than any science: why is light the thing that so many human beings chose to put at the beginning? What is it about light that feels like a start? This is the same question we keep circling here each time anew — how one reality keeps appearing in languages far from one another. Physics tells of light that preceded the stars in one tongue, the ancient text tells of light that preceded the luminaries in another, and we, who know both, can place them side by side without claiming that one predicted the other. The work is to bridge, not to choose.
So here you go: when you hear the word “light,” what comes up first — a physical phenomenon, or something hard to measure?