Videos Web

Powered by NarviSearch ! :3

Dark energy | Definition, Discoverers, & Facts | Britannica

https://www.britannica.com/science/dark-energy
dark energy, repulsive force that is the dominant component (69.4 percent) of the universe.The remaining portion of the universe consists of ordinary matter and dark matter.Dark energy, in contrast to both forms of matter, is relatively uniform in time and space and is gravitationally repulsive, not attractive, within the volume it occupies.The nature of dark energy is still not well understood.

Dark energy - Wikipedia

https://en.wikipedia.org/wiki/Dark_energy
In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales. Its primary effect is to drive the accelerating expansion of the universe.Assuming that the lambda-CDM model of cosmology is correct, dark energy is the dominant component of the universe, contributing 68% of the total energy in the present-day observable universe

What is Dark Energy? Inside our accelerating, expanding Universe

https://science.nasa.gov/universe/the-universe-is-expanding-faster-these-days-and-dark-energy-is-responsible-so-what-is-dark-energy/
Some scientists think that dark energy is a fundamental, ever-present background energy in space known as vacuum energy, which could be equal to the cosmological constant, a mathematical term in the equations of Einstein's theory of general relativity. Originally, the constant existed to counterbalance gravity, resulting in a static universe.

Dark Energy | HubbleSite

https://hubblesite.org/contents/articles/dark-energy
About halfway into the universe's history — several billion years ago — dark energy became dominant and the expansion accelerated. While ground-based studies had measured this accelerating period, Hubble's observation of 1997ff stretched back to the decelerating part of the expansion. This shift between two different eras of the

The largest 3-D map of the universe reveals hints of dark energy's secrets

https://www.sciencenews.org/article/map-universe-dark-energy-cosmology-desi
Researchers have made the largest 3-D map of the universe to study the properties of dark energy. Here a thin slice through the map is shown, with a magnified section revealing further detail.

What is dark energy? | Space

https://www.space.com/dark-energy-what-is-it
Dark energy is a hypothetical form of energy that is proposed by physicists to explain why the universe is not just expanding but is doing so at an accelerating rate. Think of dark energy as the

Dark energy survey looks 11 billion years into the past, reveals most

https://new.nsf.gov/news/dark-energy-survey-looks-11-billion-years-into-past
Researchers have measured the expansion history of the universe with the highest precision ever, providing a more detailed look at the nature of dark energy and its effect on the universe. The results are from an analysis of spectra of galaxies and quasars recorded by the Dark Energy Spectroscopic Instrument (DESI).

Dark energy is tearing the Universe apart. What if the force ... - Nature

https://www.nature.com/articles/d41586-024-01273-4
Dark-energy mapper will reconstruct 11 billion years of cosmic history "The instruments, data and measurements are spectacular," says Marc Kamionkowski, a theoretical cosmologist at Johns

Dark energy: Staring into darkness | Nature

https://www.nature.com/articles/537S201a
Dark energy is the name physicists use for whatever substance, force or property of space is messing with the Universe, making its expansion accelerate. As yet, we know almost nothing about it

What is dark energy? Inside our accelerating, expanding universe - Phys.org

https://phys.org/news/2024-02-dark-energy-universe.html
Dark energy has been described by some as having the effect of a negative pressure that is pushing space outward. ... (the Spectro-Photometer for the History of the Universe, Epoch of Reionization

Dark Energy: No Answers but More Questions - Scientific American

https://www.scientificamerican.com/article/dark-energy-no-answers-but-more-questions/
If dark energy is associated with a field that changes with time, on the other hand, we would hope to detect its w value differing from −1 and evolving throughout cosmic history.

What is dark energy? | Popular Science

https://www.popsci.com/science/what-is-dark-energy/
Dark energy is the term given to something that is causing the universe to expand faster and faster as time goes on. The great puzzle facing cosmologists today is figuring out the identity of that

The History of Dark Energy Goes Way, Way Back | Space

https://www.space.com/3119-history-dark-energy.html
But the spreading out of the cosmos started speeding up around 5 billion to 6 billion years ago. That's when scientists believe dark energy started to win the cosmic tug of war. "After we subtract

Dark Energy: The Biggest Mystery in the Universe | Smithsonian

https://www.smithsonianmag.com/science-nature/dark-energy-the-biggest-mystery-in-the-universe-9482130/
Detecting this energy allows astronomers to map those clusters and measure the influence of dark energy on their growth throughout the history of the universe. That, at least, is the hope.

Dark energy: The physics-breaking force that shapes our ... - Inverse

https://www.inverse.com/science/dark-matter-energy-explained
History of dark energy. We can trace the history of dark energy itself back to the first moments of the Big Bang, but human scientists didn't begin to suspect its existence until billions of

Deciphering the Dark: The Accelerating Universe and the Quest for Dark

https://scitechdaily.com/deciphering-the-dark-the-accelerating-universe-and-the-quest-for-dark-energy/
Dark energy's role in propelling the universe's accelerated expansion presents a pivotal challenge in astrophysics, driving ongoing research and space missions dedicated to uncovering the nature of this mysterious force. ... and approximately 68.3 to 70% of the universe is dark energy. A Brief History It All Started With Cepheids. Dark

The discovery of dark energy - Explaining Science

https://explainingscience.org/2019/12/02/the-discovery-of-dark-energy/
The dark lines are known as absorption lines and the bright lines emission lines. Each line is due to an energy transition in a particular type of atom or molecule and always occurs at the same wavelength. For example, the hydrogen alpha spectral line occurs at a wavelength of 656.3 nanometres. The hydrogen alpha line occurs when an electron

Does Dark Energy Really Exist? | Scientific American

https://www.scientificamerican.com/article/does-dark-energy-really-exist-extreme-physics-special/
120 times less than we may have naively expected. Physicists have ideas for what it might be, but they remain speculative. In short, we are very much in the dark about dark energy. Researchers are

DOE Explains...Cosmic Acceleration and Dark Energy

https://www.energy.gov/science/doe-explainscosmic-acceleration-and-dark-energy
Scientists are conducting studies to determine whether dark energy is consistent with the cosmological constant, a term Albert Einstein originally included in his equations to counterbalance gravity. Alternatively, dark energy may not be constant, but something that changes over the history of the universe. Dark energy accounts for about 70% of

Dark Energy And The Joy Of Being Wrong - NPR

https://www.npr.org/sections/13.7/2012/03/20/148985296/dark-energy-and-the-joy-of-being-wrong
The Story Of Dark Energy, In A Nutshell : 13.7: Cosmos And Culture It wasn't long ago that we thought expansion of the universe was slowing down. Whoops! Science then identified Dark Energy as a

Does Dark Energy Change over Time? | Scientific American

https://www.scientificamerican.com/article/does-dark-energy-change-over-time/
Cosmology. Dark energy may be even more complicated than scientists have bargained for, potentially "evolving" over time rather than remaining relentlessly constant in its acceleration of

What is Dark Energy, and how was it discovered?

https://physics.stackexchange.com/questions/24869/what-is-dark-energy-and-how-was-it-discovered
Dark Energy is the name given to the acceleration of the expansion of the universe. While it is a powerful force on the scale of the entire universe, it should be noted that it is not a very powerful force on scales smaller than the distances between galaxies. In fact, even the gravitational force between the Milky Way and Andromeda appears to

We have never seen dark matter and dark energy. Why do we think they

https://www.space.com/what-if-dark-energy-does-not-exist
Cosmological models show that dark energy accounts for 68% of all energy in the cosmos, according to NASA. But astronomers admit that the evidence for its existence is a bit vague.

Readers discuss dark energy, Ötzi's tattoos and sneaky plant invasions

https://www.sciencenews.org/article/dark-energy-otzi-tattoo-plant-invasion
New data hint that dark energy's density, commonly thought to remain constant, might vary over time, Emily Conover reported in "3-D map hints at dark energy's secrets" (SN: 5/4/24 & 5/18

The dominant model of the universe is creaking - The Economist

https://www.economist.com/science-and-technology/2024/06/19/the-dominant-model-of-the-universe-is-creaking
The study of dark energy is surprisingly new. Direct evidence for its existence was not detected until 1998, when scientists discovered that extremely bright exploding stars called supernovas were

Observational Evidence to Logistic Dark Energy Driving the Accelerating

https://arxiv.org/abs/2406.18095
View a PDF of the paper titled Observational Evidence to Logistic Dark Energy Driving the Accelerating Universe, by Sarath Nelleri and 1 other authors

The dark history of the Pride March in photos - MSN

https://www.msn.com/en-us/news/world/the-dark-history-of-the-pride-march-in-photos/ss-BB1p9E1X
Meanwhile, activist Craig Rodwell came up with another way to harness the energy of Stonewall. He proposed an annual reminder of the riots. That reminder became the Pride March we know today.

Dark matter: How primordial black holes could explain a long ... - CNN

https://www.cnn.com/2024/06/17/science/black-holes-dark-matter-scn/index.html
Scientists studying the earliest black holes may have found an explanation for dark matter, putting Stephen Hawking's theory on the subject back into the spotlight. CNN values your feedback 1.

Power outage leaves millions of Ecuadorians in the dark after

https://apnews.com/article/ecuador-blackout-transmission-line-327e0637ef2c56f54181a5a920b166d9
A failure in an energy transmission line has produced an blackout throughout Ecuador, the government reported, days after announcing that there would be new power outages in the country due to production problems. ... Power outage leaves millions of Ecuadorians in the dark after transmission line fails. People walk outside of a metro station

How to get free Monster Energy Lo Profile skin in MW3 & Warzone

https://www.charlieintel.com/call-of-duty/how-to-get-free-monster-energy-lo-profile-skin-in-mw3-warzone-330532/
If you're wondering how to get this new Monster Energy skin for free, here's all you need to know. How to get Monster Energy Blue skin. To get the new Monster Energy Blue Lo Profile skin in MW3 and Warzone, players will need to redeem a code within the Call of Duty website.Here's a step-by-step guide on how you can do this: