Expansion Of The Universe


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The universe is expanding faster than it should be

The Universe Is Expanding Faster Than It Should Be

The latest measurements with the Hubble Space Telescope suggest the universe is expanding faster than scientists' models predict—a hint that some unknown ingredient could be at work in the cosmos. Dec 17, 2021 ... The latest measurements with the Hubble Space Telescope suggest the universe is expanding faster than scientists' models predict—a hint that ... [ReadMore..]

Scientist who helped discover the expansion of the universe is ...

Scientist Who Helped Discover The Expansion Of The Universe Is ...

Breakthrough Prize winner continues investigating fundamental physics of the world Feb 3, 2015 ... In the late 1980s, astrophysicist Saul Perlmutter and his colleagues set out to determine how much the expansion of the universe was slowing ... [ReadMore..]

Expanding Confusion: common misconceptions of cosmological ...

Expanding Confusion: Common Misconceptions Of Cosmological ...

We use standard general relativity to illustrate and clarify several common misconceptions about the expansion of the Universe. To show the abundance of these misconceptions we cite numerous misleading, or easily misinterpreted, statements in the literature. In the context of the new standard Lambda-CDM cosmology we point out confusions regarding the particle horizon, the event horizon, the ``observable universe'' and the Hubble sphere (distance at which recession velocity = c). We show that we can observe galaxies that have, and always have had, recession velocities greater than the speed of light. We explain why this does not violate special relativity and we link these concepts to observational tests. Attempts to restrict recession velocities to less than the speed of light require a special relativistic interpretation of cosmological redshifts. We analyze apparent magnitudes of supernovae and observationally rule out the special relativistic Doppler interpretation of cosmological redshifts at a confidence In the context of the new standard Lambda-CDM cosmology we point out confusions regarding the particle horizon, the event horizon, the ``observable universe'' ... [ReadMore..]

The Universe's Expansion Could End Surprisingly Soon, Say ...

The Universe's Expansion Could End Surprisingly Soon, Say ...

The universe is not only expanding but accelerating away from us. Now a new theory suggests all this could stop sooner than anyone imagined. Jan 26, 2022 ... The universe is not only expanding but accelerating away from us. Now a new theory suggests all this could stop sooner than anyone imagined. [ReadMore..]

Mystery of Universe's Expansion Rate Widens With New Hubble ...

Mystery Of Universe's Expansion Rate Widens With New Hubble ...

The universe is getting bigger every second — but how fast? Astronomers using NASA's Hubble Space Telescope say they have crossed an important threshold in revealing a discrepancy between the two key techniques for measuring the universe's expansion rate. Apr 25, 2019 ... Hubble measurements suggest a faster expansion rate in the modern universe than expected, based on how the universe appeared more than 13 ... [ReadMore..]

The universe could stop expanding 'remarkably soon', study suggests

The Universe Could Stop Expanding 'remarkably Soon', Study Suggests

In just 100 million years, the universe could start to shrink, new research suggests. May 2, 2022 ... After nearly 13.8 billion years of nonstop expansion, the universe could soon grind to a standstill, then slowly start to contract, ... [ReadMore..]

Tests for the Expansion of the Universe

Tests For The Expansion Of The Universe

Almost all cosmologists accept nowadays that the redshift of the galaxies is due to the expansion of the Universe (cosmological redshift), plus some Doppler effect of peculiar motions, but can we be sure of this fact by means of some other independent cosmological test? Here I will review some recent tests: CMBR temperature versus redshift, time dilation, the Hubble diagram, the Tolman or surface brightness test, the angular size test, the UV surface brightness limit and the Alcock--Paczyński test. Some tests favour expansion and others favour a static Universe. Almost all the cosmological tests are susceptible to the evolution of galaxies and/or other effects. Tolman or angular size tests need to assume very strong evolution of galaxy sizes to fit the data with the standard cosmology, whereas the Alcock--Paczynski test, an evaluation of the ratio of observed angular size to radial/redshift size, is independent of it. Jan 7, 2015 ... Almost all cosmologists accept nowadays that the redshift of the galaxies is due to the expansion of the Universe (cosmological redshift), plus ... [ReadMore..]

Dark Energy, Dark Matter | Science Mission Directorate

Dark Energy, Dark Matter | Science Mission Directorate

As more space comes into existence, more of this energy-of-space would appear. As a result, this form of energy would cause the universe to expand faster and ... [ReadMore..]

The Expanding Universe

The Expanding Universe

The universe is in a constant state of change. The expanding universe, a new idea based on modern physics, laid to rest the paradoxes that troubled astronomers ... [ReadMore..]

cosmology - The cosmological expansion | Britannica

Cosmology - The Cosmological Expansion | Britannica

When the universe is viewed in the large, a dramatic new feature, not present on small scales, emerges—namely, the cosmological expansion. On cosmological scales, galaxies (or, at least, clusters of galaxies) appear to be racing away from one another with the apparent velocity of recession being linearly proportional to the distance of the object. This relation is known as the Hubble law (after its discoverer, the American astronomer Edwin Powell Hubble). Interpreted in the simplest fashion, the Hubble law implies that 13.8 billion years ago all of the matter in the universe was closely packed together in an incredibly dense According to the evolutionary, or big bang, theory of the universe, the universe is expanding while the total energy and matter it contains remain constant. [ReadMore..]

Accelerating expansion of the universe - Wikipedia

Accelerating Expansion Of The Universe - Wikipedia

Observations show that the expansion of the universe is accelerating, such that the velocity at which a distant galaxy recedes from the observer is ... [ReadMore..]