“By its very nature science knows no boundaries. Walling off any group, for any reason, from full participation damages the entire enterprise of science. We must be scientists without borders.” -Rocky Kolb
We normally think of “let there be light” as when the Universe got its start. In a particular sense, this is true, since you can go back to a time before stars and galaxies existed, when the Universe was only a few million years old or less. But even before the first star, there was still light.
And while that light’s origin can be traced back to the cosmic microwave background and the formation of neutral atoms, there was light even earlier than that. In fact, the very first light arose from the annihilation of matter and antimatter, and from the end of cosmic inflation at the very beginning of as far back as we can trace.