Cosmic Voids: Where Dark Energy Dominates and Drives Universe Expansion Cosmic voids, the vast empty regions between galaxies and cosmic structures, appear devoid of matter, radiation, dark matter, and other components. However, they are not truly empty. According to quantum field theory, space is filled with pervasive quantum fields that correspond to all particles. Even without particles, these fields persist, carrying vacuum energy due to quantum fluctuations and the Heisenberg uncertainty principle. This vacuum energy is identified as dark energy, the force accelerating the universe's expansion. In dense regions like galaxies, clusters, filaments, and walls of the cosmic web, matter dominates, rendering dark energy's influence negligible. Everyday physics remains unaffected by it. In contrast, cosmic voids lack significant matter, allowing vacuum energy—or dark energy—to become the primary factor. Here, dark energy drives the accelerated expansion most effectively. Voids actively grow as dark energy pushes space outward, pressing against surrounding structures and gradually stretching the cosmic web apart. Over billions of years (roughly 5–20 billion), this process will dilute the large-scale structure of galaxies and filaments as voids expand further. The article emphasizes that voids highlight dark energy's role: while the universe's emptiest places lack matter, they are rich in the subtle energy of spacetime itself, ensuring no region is ever truly empty or isolated from this fundamental force.

Cosmic Voids: Where Dark Energy Dominates and Drives Universe Expansion

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New Method Uses Gravitational Waves to Improve Measurements of the Universe's Expansion Astronomers have long known that the universe is expanding, but the exact rate of expansion, measured by the Hubble constant, remains a mystery. Multiple methods used to calculate this constant have produced conflicting results, leading to the so-called 'Hubble tension.' Researchers from the University of Illinois and the University of Chicago have developed a new technique that uses gravitational waves—ripples in spacetime caused by black hole collisions—to measure the expansion rate. This approach refines earlier gravitational wave-based methods and promises more accurate measurements as detectors improve. Their findings show that gravitational waves could provide an independent way to measure the Hubble constant, potentially resolving the tension in current estimates. This research could offer insights into the universe's age and composition, and the team hopes to apply it to future data. The method relies on a new concept called the 'stochastic siren,' which uses the background gravitational wave hum from numerous black hole mergers, not detectable individually, to estimate cosmic expansion. This technique may help narrow the range of the Hubble constant and resolve the discrepancies in current cosmological models.

New Method Uses Gravitational Waves to Improve Measurements of the Universe's Expansion

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Gravitational Wave "Hum" from Merging Black Holes Gives New Measure of Universe's Expansion Rate Every black hole collision in the universe sends ripples through spacetime. Most of those ripples are too faint, originating too far away, for any

Gravitational Wave “Hum” from Merging Black Holes Gives New Measure of Universe’s Expansion Rate #Science #Space #Cosmology #GravitationalWaves #BlackHoles #UniverseExpansion

scienceblog.com/gravitational-wave-hum-f...

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✨ Publication finale du Dark Energy Survey
L'analyse la plus précise à ce jour confirme le modèle cosmologique standard avec une énergie noire constante.

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#Goodnews #Release #Darkenergy #Cosmologywin #Universeexpansion #Sciencebreakthrough #Bot

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✨ Dark Energy Survey's Definitive Cosmic Map
A six-year, 669-million-galaxy analysis confirms the standard model of cosmology with unprecedented precision

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✨ Abschluss der Dark Energy Survey: Bestätigung des kosmologischen Standardmodells
Die umfassendste Analyse der kosmischen Expansion verfeinert die Messungen um den Faktor zwei und stützt das ΛCDM-Modell mit konstanter Dunkler Energie.

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Original post on mastodon.cosmicnation.co

🌌🔭 Dark Energy Survey’s grand finale! After 6 years mapping 669 million galaxies, scientists release the most comprehensive analysis yet—twice as tight on cosmic expansion, aligning with the standard ΛCDM model (constant dark energy). A dream come true for cosmology, paving the way for future […]

A New Window on the Expansion of the Universe Astronomers at the University of Tokyo have used gravitational lensing to measure how fast the universe is expanding, adding weight to one of cosmology's most intriguing mysteries. Their technique exploits...

A New Window on the Expansion of the Universe #Science #Space #Astronomy #UniverseExpansion #Cosmology #Astrophysics

Gravitational Lensing Reveals a Twist in the Universe’s Expansion New measurements using gravitational lensing suggest the universe’s current expansion rate does not agree with signals from the early cosmos. Cosmologists are facing a major unresolved issue: the measured...

Gravitational Lensing Reveals a Twist in the Universe’s Expansion #Science #Space #Cosmology #GravitationalLensing #UniverseExpansion #CosmologyInsights

Yes, the Universe Can Expand Faster Than Light An expanding universe complicates this picture just a little bit, because the universe absolutely refuses to be straightforward.

Yes, the Universe Can Expand Faster Than Light #Science #Space #Cosmology #UniverseExpansion #FasterThanLight

A groundbreaking new study proposes that Earth and the Milky Way might actually be located inside a vast cosmic void — a region of space containing far less matter than the cosmic average.

#CosmicVoid #HubbleTension #MilkyWay #Astrophysics #UniverseExpansion

Universe Expansion May Be Slowing, Not Accelerating, Study Suggests A new study challenges the Nobel-winning theory that the universe's expansion is accelerating, suggesting instead that it may be slowing down as dark energy weakens -- potentially leading to a future

Universe Expansion May Be Slowing, Not Accelerating, Study Suggests #Technology #Other #UniverseExpansion #Astrophysics #ScientificStudy

Is the expansion of the universe slowing down? It is widely accepted that the universe is expanding at an accelerating rate, but now researchers say our measurements of the mysterious force driving that may be wrong and that the universe began to...

Is the expansion of the universe slowing down? #Science #Space #Cosmology #UniverseExpansion #SpaceScience

Universe expansion may be slowing, not accelerating, study suggests Astronomers cast doubt on Nobel prize-winning theory and suggest universe could end in ‘big crunch’ Astronomers have cast doubt on a Nobel prize-winning theory that the expansion of the universe is...

Universe expansion may be slowing, not accelerating, study suggests #Science #Space #Cosmology #UniverseExpansion #Astronomy

Could Earth Be Inside a Vast Cosmic Bubble? New Study Suggests So Scientists suggest Earth and the Milky Way may reside in a vast cosmic void, potentially resolving discrepancies in measuring the universe’s expansion rate. 🌌 #CosmicVoid #HubbleTension #UniverseExpansion #Cosmology #Astronomy

Scientists suggest Earth and the Milky Way may reside in a vast cosmic void, potentially resolving discrepancies in measuring the universe’s expansion rate. 🌌 #CosmicVoid #HubbleTension #UniverseExpansion #Cosmology #Astronomy

The Cosmic Role of Intelligent Species: Why Our Existence Matters During the Universe's Expansion! Explore why intelligent species exist today, their cosmic purpose, and how their legacy may guide universal survival. Visit to learn more.

Discover why #intelligent #species exist during universal expansion, their #cosmic mission, and how we shape interstellar legacy. Visit to learn more.

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Hubble bubble, void solves trouble with universe expansion If we are located in a region with below-average density such as the green dot, then matter would flow away from us due to stronger gravity from the surrounding denser regions, as shown by the red arrows....

Hubble bubble, void solves trouble with universe expansion #Science #Space #Cosmology #HubbleBubble #UniverseExpansion #CosmologyInsights

All-sky map from the COBE satellite showing the Cosmic Microwave Background Radiation (CMBR). Redshifted (cooler) and blueshifted (hotter) areas reveal the Local Group's 600 km/s movement relative to the CMBR. This unexpected speed highlights the mysteries of our universe's motion. The colors represent temperature variations in the CMBR.

Astronomy Picture from 08/10/2006

CMBR Dipole: Speeding Through the Universe

Source: https://apod.nasa.gov/apod/ap061008.html


#CosmicMicrowaveBackground #CMBR #Redshift #Blueshift #COBE #NobelPrizePhysics #GalaxyMotion #UniverseExpansion #Astrophysics #SpaceExploration

False-color Hubble Space Telescope image of a massive, distant galaxy cluster. Thousands of galaxies, each similar to our Milky Way, are visible. This cluster's existence challenges current cosmological models due to its age and mass, suggesting the Universe may be less massive than previously thought.

Astronomy Picture from 21/08/1998

A Massive Cluster In A Young Universe

Source: https://apod.nasa.gov/apod/ap980821.html


#GalaxyCluster #HubbleSpaceTelescope #Cosmology #Astrophysics #EarlyUniverse #ChallengingTheories #SpaceExploration #DeepSpace #UniverseExpansion #Astronomy

All-sky map showing the Cosmic Microwave Background (CMB) dipole anisotropy. The colors represent temperature variations caused by the motion of our Local Group of galaxies relative to the CMB at 600 km/s. Blueshifted (hotter) radiation is in the direction of motion, redshifted (colder) in the opposite direction. This high speed and its cause remain unexplained.

Astronomy Picture from 27/06/1999

COBE Dipole: Speeding Through the Universe

Source: https://apod.nasa.gov/apod/ap990627.html


#CosmicMotion #GalaxySpeed #RedshiftBlueshift #CMBDipole #UniverseExpansion #Astrophysics #Cosmology #SpaceExploration #MilkyWay #LocalGroup

Is Dark Energy Evolving? New Findings Could Rewrite Cosmic Theory New Data Suggests Dark Energy May Be Evolving: A Game-Changer for Understanding the Universe Astronomers have made a groundbreaking discovery

Dark Energy’s Surprising Evolution: What New Data Tells Us About the Universe
#DarkEnergy #Cosmology #SpaceResearch #Universe #Astronomy #CosmicMysteries #DESI #Astrophysics #ScienceNews #NewDiscovery #Galaxies #ExpansionOfTheUniverse #DarkMatter #UniverseExpansion #AstrophysicsResearch

How Edwin Hubble Proved the Universe Is Bigger Than We Thought A century ago, Edwin Hubble revolutionized our understanding of the universe by proving that the Milky Way is just one of many galaxies in an ever-expanding cosmos. This breakthrough led to the discovery...

How Edwin Hubble Proved the Universe Is Bigger Than We Thought #Science #Space #Astronomy #EdwinHubble #UniverseExpansion #AstronomyHistory

The Universe is Expanding: The universe is growing faster than we thought, with galaxies moving away from each other at increasing speeds—thanks to dark energy! 🚀 #UniverseExpansion #CosmicMystery Van Gogh’s Starry Night: The swirling patterns in Van Gogh’s famous painting Starry Night are eerily similar to the turbulent flow of fluid dynamics, like in space! 🎨 #ArtMeetsScience #CosmicArt Diamond Planets: Some planets, like 55 Cancri e, are believed to be made of diamond due to their carbon-rich composition—imagine a planet that’s basically a giant gem! 💎 #SpaceTreasure #PlanetFacts

Jupiter’s Great Red Spot is a giant storm that has been raging for over 400 years—it’s so big that Earth could fit inside it! 🌪️ #SpaceFacts The Milky Way is on a collision course with the Andromeda Galaxy, but don’t worry—it won’t happen for another 4 billion years! 🌌 #GalaxyCollision Saturn’s rings are made up of billions of ice and rock particles, some as small as a grain of sand and others as large as mountains! 🪐 #RingedPlanet

Jupiter’s Great Red Spot is a giant storm that has been raging for over 400 years—it’s so big that Earth could fit inside it! 🌪️ #SpaceFacts #GalaxyCollision #ArtMeetsScience #CosmicArt #UniverseExpansion #CosmicMystery #BlueskyArt #Art

5/8 Dark energy was discovered in the late 1990s when astronomers found cosmic expansion was accelerating rather than slowing. Until now, scientists assumed dark energy remained constant, but DESI's findings challenge this fundamental view.
#DarkEnergy #UniverseExpansion

Scanning electron micrograph of a tiny sphere (slightly over 0.1 mm) demonstrating the Casimir Effect. This effect, caused by vacuum energy fluctuations, provides evidence supporting the theory that the universe will continue expanding indefinitely due to dark energy. The image shows the sphere moving toward a smooth plate.

Astronomy Picture from 06/12/2015

A Force from Empty Space: The Casimir Effect

Source: https://apod.nasa.gov/apod/ap151206.html


#CasimirEffect #DarkEnergy #Cosmology #UniverseExpansion #QuantumPhysics #Nanotechnology #Science #Space #Astronomy #Physics

Stunning image of a 1994 supernova on the outskirts of a spiral galaxy. This observation, part of research that led to the discovery of dark energy and the accelerating expansion of the universe, was pivotal in earning the 2011 Nobel Prize in Physics. The bright spot in the galaxy is the supernova, a powerful stellar explosion. The image highlights the vastness of space and the mysteries of dark energy.

Astronomy Picture from 09/10/2011

Nobels for a Strange Universe

Source: https://apod.nasa.gov/apod/ap111009.html


#DarkEnergy #Cosmology #Supernova #AcceleratingUniverse #NobelPrizePhysics #Astronomy #Space #Galaxy #DarkMatter #UniverseExpansion #Science #Cosmophysics #Astrophysics

Stunning image of NGC 1365, a barred spiral galaxy in the Fornax Cluster. Its prominent bar and spiral arms, rich with young blue stars and dark dust lanes, showcase a strong rotating density wave of star formation. NGC 1365's proximity allows for accurate measurements aiding in estimating the universe's expansion rate.

Astronomy Picture from 13/04/2003

NGC 1365: A Nearby Barred Spiral Galaxy

Source: https://apod.nasa.gov/apod/ap030413.html


#NGC1365 #SpiralGalaxy #BarredSpiral #FornaxCluster #GalaxyRotation #StarFormation #Cosmology #UniverseExpansion #Astronomy #Astrophysics #Space #Galaxy