The expansion of the universe was discovered by separate theoretical and observational work in the 1920s. Since then, the expansion has become a core aspect of the astrophysical field of …

expanding universe, dynamic state of the extragalactic realm, the discovery of which transformed 20th-century cosmology.

Jan 24, 2025 · Since that moment—some 13.8 billion years ago—the universe has been expanding through time, creating more and more space in the process. That is why modern …

Jan 18, 2022 · When the universe was just 10 -34 of a second or so old — that is, a hundredth of a billionth of a trillionth of a trillionth of a second in age — it experienced an incredible burst of...

This expansion, usually referred to as the "metric expansion" of space, is a “broad-brush effect” in that individual galaxies themselves are not expanding, but the clusters of galaxies into which …

May 4, 2025 · To answer those questions, we need to trace the story of the expanding universe—from ancient stargazers to modern-day telescopes probing the edges of time itself.

4 days ago · The early universe probe, which uses cosmological models to indirectly provide the current expansion rate of the universe, favors an expansion rate of ~67 km/s/Mpc; and the late …

Nov 23, 2025 · Expansion operates on scales where speed-of-light limitations cease applying, permitting universe to expand faster than light at cosmic distances. This apparent paradox …

May 5, 2025 · We see an infinite universe expanding into itself. The name Big Bang conveys the idea of a firecracker exploding at a time and a place - with a center. The universe doesn't have …

Chapter 13 presents the observational evidence for the expansion and age of the Universe and the basis of the Big Bang theory. The chapter begins by presenting some historical …