Expansion of the universe - Wikipedia
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 …
A new attempt to explain the accelerated expansion of the universe
Oct 15, 2025 · Why is the universe expanding at an ever-increasing rate? This is one of the most exciting yet unresolved questions in modern physics. Because it cannot be fully answered …
Expanding universe | Description & Facts | Britannica
expanding universe, dynamic state of the extragalactic realm, the discovery of which transformed 20th-century cosmology.
What is Dark Energy? Inside Our Accelerating, Expanding Universe - NASA ...
May 2, 2025 · Some 13.8 billion years ago, the universe began with a rapid expansion we call the big bang. After this initial expansion, which lasted a fraction of a second, gravity started to slow …
Is the universe infinite, or does it have a limit? | Space
Oct 13, 2025 · If the universe is expanding, then what is it expanding into, and what is it expanding from? Where's the edge of the universe, and where is its center?
The Ultimate Fate of the Universe: Expansion, Collapse, or …
Aug 26, 2025 · If the universe is expanding now, will it continue forever, or will it slow and reverse under the pull of gravity? The answer depends on two opposing forces: the attractive pull of …
Ask Ethan: Why couldn’t the Universe have expanded forever?
5 days ago · For 13.8 billion years, the Universe has been expanding. But that couldn't have been the case for an eternity, and science has proven it.
What is the universe expanding into? - Astronomy Magazine
Nov 11, 2024 · The fabric of space-time itself is what is expanding, so we cannot truly say that the universe is expanding “into” anything else.
Universe expansion study confirms challenge to cosmic theory
Dec 9, 2024 · New observations from the James Webb Space Telescope suggest that a new feature in the universe -- not a flaw in telescope measurements -- may be behind the decade …
What is the universe expanding into if it's already infinite?
Dec 9, 2024 · Scientists know the universe is expanding because they can track other galaxies as they move away from ours. They define expansion using the rate that other galaxies move …