How three pioneering space missions turned the cosmic microwave background into a precision map of the infant universe, from COBE’s first detection of primordial ripples to WMAP’s standard model and Planck’s high-resolution confirmation.
Explore the origin and evolution of the universe from the Planck epoch to the present day. This interactive reference covers cosmic inflation, the formation of the first elements, the cosmic microwave background, and the emergence of stars and galaxies, grounded in the Lambda-CDM model.
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.
Explore the shape and evolution of the cosmos from the Planck epoch to today. Learn how the cosmic microwave background, inflation, and large-scale structure reveal a universe that is flat to within 0.4 percent—yet whose global topology remains unknown.
Cosmic reionization was the transformative period when ultraviolet light from the first stars and galaxies ionized the neutral hydrogen that filled the early universe, ending the cosmic dark ages and making space transparent to light. This article explores the full timeline from the Planck epoch to structure formation, the role of the cosmic microwave background, and the key missions that revealed this history.
The Big Bang theory is often misunderstood. This guide debunks common myths and explains the true origin and evolution of the universe, from the Planck epoch to the present day.
A cosmic horizon marks the boundary of what we can observe in an expanding universe. The particle horizon defines the edge of the observable universe, while the event horizon sets the limit of future observations. This guide explains the concept and traces the cosmic epochs from the Planck era to structure formation.
Large-scale structure—the cosmic web of galaxies and dark matter—offers one of the most powerful tests of the standard cosmological model. From the imprint of primordial fluctuations to the growth of clusters and voids, its patterns confirm the Lambda-CDM framework and reveal the history of the universe from the Planck epoch to today.
Cosmic inflation is the theory that the universe underwent an exponential expansion in the first fraction of a second after the Big Bang. This guide explains how inflation solved the horizon and flatness problems, seeded the large-scale structure, and set the stage for the cosmic epochs that followed—from the Planck epoch to the formation of stars and galaxies.
Critical density is the precise average matter density that separates a universe that expands forever from one that eventually recollapses. This article explains the concept, its equation, its role in the Friedmann equations, and how it connects to the major epochs of cosmic history—from the Planck epoch to the formation of stars and galaxies.
