The formation of the first stellar systems and galaxies.
The first black holes emerged from the chaotic aftermath of the Big Bang, but their origins remain one of cosmology’s deepest puzzles. This guide explores the leading theories—light seeds from the first stars and heavy seeds from direct gas collapse—and places them in the full context of cosmic evolution, from the Planck epoch to the present day.
The first stars emerged roughly 100–200 million years after the Big Bang, ending the cosmic dark ages. This article traces the full evolution of the universe—from the Planck epoch through inflation, recombination, and reionization—and explains how the first atoms, stars, and galaxies formed, with key evidence from COBE, WMAP, Planck, and JWST.
Population III stars are the hypothetical first generation of stars, formed from primordial hydrogen and helium. They were likely massive, hot, and short-lived, and their radiation reionized the early universe. This article explores their formation, properties, and cosmic significance.
The first galaxies formed a few hundred million years after the Big Bang, ending the cosmic dark ages. Learn about the epochs of the early universe, the role of dark matter, the first stars, and how telescopes like JWST are rewriting our understanding of cosmic dawn.
Galaxies formed from tiny quantum fluctuations in the early universe, growing through gravitational attraction and merging over billions of years. This guide explains the cosmic epochs from the Planck era to the present, the role of dark matter, and the evidence from the cosmic microwave background.
