Expansion of the universe - Wikipedia
The expansion of the universe is the increase in distance between gravitationally unbound parts of the observable universe with time. [1] It is an intrinsic expansion, so it does not mean that the universe expands "into" anything or that space exists "outside" it.
NASA's Webb, Hubble Telescopes Affirm Universe's Expansion ...
Mar 11, 2024 · The puzzle, called the "Hubble Tension," is that the current rate of the expansion of the universe is faster than what astronomers expect it to be, based on the universe's initial conditions and our present understanding of the universe’s evolution.
Webb Confirms Accuracy of Universe’s Expansion Rate Measured ...
Sep 12, 2023 · We can predict the expansion rate of the universe by observing its baby picture, the cosmic microwave background, and then employing our best model of how it grows up over time to tell us how fast the universe should be expanding today.
Expanding universe | Description & Facts | Britannica
Oct 17, 2024 · Expanding universe, dynamic state of the extragalactic realm, the discovery of which transformed 20th-century cosmology. The development of general relativity and its application to cosmology, along with the detection of extragalactic redshift, led to the realization in the 1920s that all galaxies are receding.
What is Dark Energy? Inside our accelerating, expanding Universe
Feb 5, 2024 · 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 the universe down. But the cosmos wouldn’t stay this way.
Our expanding universe: Age, history & other facts | Space
Mar 15, 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...
Why is the universe expanding faster than predicted? A ...
Nov 24, 2023 · The universe is expanding faster than predicted by popular models in cosmology. Credit: NASA. Astronomers have known for decades that the universe is expanding. When they use telescopes to...