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.
Expanding universe | Description & Facts | Britannica
2024年11月27日 · 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.
Our expanding universe: Age, history & other facts | Space
2022年3月15日 · 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...
Expanding Into What? The Universe’s Infinite Growth Explained
2024年12月18日 · The expansion of the universe works similarly — but with one key difference. While dough expands into the pan, the universe doesn’t expand into anything. It expands within itself. This idea can feel like a brain teaser because the universe includes everything that exists. There’s no external “pan” holding it.
What is Dark Energy? Inside our accelerating, expanding Universe
2024年2月5日 · 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.
What is the universe expanding into if it’s already infinite?
2024年12月9日 · 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 away from us.
Exploring the Mystery of Our Expanding Universe
2024年10月11日 · The abstract concepts of the scope and origin of our universe and the unimaginable scale of cosmology can be difficult to communicate to learners. However, simple models and simulations can help make these topics more tangible. See below to find out how, plus explore more resources about our expanding universe.
How fast is the universe expanding? Galaxies provide one answer.
2021年3月8日 · Determining how rapidly the universe is expanding is key to understanding our cosmic fate, but with more precise data has come a conundrum: Estimates based on measurements within our local universe don’t agree with extrapolations from the era shortly after the Big Bang 13.8 billion years ago.
How Astronomers Discovered the Universe Is Expanding
5 天之前 · The finding amounted to groundbreaking evidence that the universe is expanding. The Great Debate: How Many Galaxies? Edwin P. Hubble Papers, Huntington Library, San Marino, California/NASA.
ESA - Webb & Hubble confirm Universe’s expansion rate
2024年3月11日 · The rate at which the Universe is expanding, known as the Hubble constant, is one of the fundamental parameters for understanding the evolution and ultimate fate of the cosmos. However, a persistent difference, called the Hubble Tension, is seen between the value of the constant measured with a wide range of independent distance indicators and ...
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