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.

Jan 10, 2025 · expanding universe, dynamic state of the extragalactic realm, the discovery of which transformed 20th-century cosmology.

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 expansion...

20 hours ago · “The Universe expanding is like a rubber band being stretched. If dark energy is not constant, that would be like stretching the rubber band by different amounts at different points,” says Möller. “I think in the next decade we will be able to constrain whether dark energy is constant or evolving with cosmic time. Rubin will allow us to ...

Nov 19, 2019 · When scientists talk about the expanding universe, they mean that it has been growing ever since its beginning with the Big Bang. Galaxy NGC 1512 in Visible Light External. Photo taken by the Hubble Space Telescope External. The galaxies outside of our own are moving away from us, and the ones that are farthest away are moving the fastest.

Feb 5, 2024 · Nine billion years after the universe began, its expansion started to speed up, driven by an unknown force that scientists have named dark energy. But what exactly is dark energy? The short answer is: We don’t know.

Dec 18, 2024 · What is the universe expanding into if it’s already infinite? The universe expands by itself, not into any external space, with galaxies continuously moving away from the Milky Way. Initiated by the Big Bang, this expansion is accelerating due to dark energy, which comprises most of the universe’s total energy.

Dec 9, 2024 · At the left of the funnel is the Big Bang, and since then, the universe has expanded at a faster and faster rate. NASA. Dark matter and dark energy make up most of the universe. Green Bank...

Jan 16, 2025 · The Universe really seems to be expanding fast. Too fast, even. A new measurement confirms what previous — and highly debated — results had shown: The Universe is expanding faster than predicted by theoretical models, and faster than can be explained by our current understanding of physics. This discrepancy between model and data became known as the Hubble tension.

Nov 11, 2024 · Universal expansion causes galaxies to recede from each other. Galaxies close to us recede at a slower rate than those farther away. As demonstrated by the balloon model, the space-time “fabric”...