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© 2026 Developments Today. All rights reserved.

cosmology Articles | Developments Today

eternal recurrence | The Philosophy Corner (via naturalistphilosophy.wordpress.com)

Eternal Recurrence: The Surprising Upsides of a Universe That Repeats

Sean Carroll discusses the possibility of an eternally repeating universe.
The idea stems from cosmological models where infinite time leads to repetition.
Carroll suggests that repetition gives our lives cosmic significance.
Quantum mechanics may allow for variations in each cycle.

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DT Editorial Team·Aug 18, 2026·via newscientist.com

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Homing in on the X-ray sky with eROSITA's second data release

eROSITA’s Second Public Release Doubles the Known X-Ray Sky

The German eROSITA consortium released its second major public X-ray dataset.
DR2 includes nearly 2 million sources detected across the western half of the sky.
The release roughly doubles the number of detected sources compared with DR1.
Researchers say the dataset supports both broad cosmology tests and new source discovery.

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DT Editorial Team·Aug 1, 2026·via phys.org

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New radio-burst method helps locate universe's missing ordinary matter

Fast Radio Bursts Help Scientists Track the Universe’s Missing Matter

Researchers analyzed thousands of fast radio bursts to measure how matter distorts their signals.
The method links missing ordinary matter to diffuse clouds around groups of galaxies.
The findings support models in which material is pushed far beyond galaxies’ bright visible regions.

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DT Editorial Team·Jul 21, 2026·via phys.org

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![The full trail of galaxies, with an inset image of DF9 taken by the Hubble Space Telescope. Credit: Keim et al. (2026)/DECaLS/HST](/article_images/YN_DF9-drak-galaxy_20260630_213201.jpg) *The full trail of galaxies, with an inset image of DF9 taken by the Hubble Space Telescope. Credit: Keim et al. (2026)/DECaLS/HST*

Third dark-matter-free galaxy adds to astronomy puzzle

Astronomers report DF9 as the third known galaxy that appears to lack dark matter.
DF9 sits alongside DF2 and DF4 in a linear structure of seven galaxies about 45 million light-years away.
The galaxy’s estimated mass is consistent with visible matter alone, based on stellar motions.
The finding supports the idea that some galaxies may form through an extreme collision-driven process.

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DT Editorial Team·Jul 1, 2026·via universetoday.com

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This NASA Hubble Space Telescope image features a swarm of galaxies in the galaxy cluster called CL0016+1609 or MACS J0018.5+1626. Credit: NASA/ESA/STScI/H. Ebeling/D. Coe/G. Kober

Hubble and Chandra Reveal a Cluster Collision in Deep Space

Hubble and Chandra observations show CL0016+1609 is two clusters merging along our line of sight.
Researchers are using gravitational lensing to measure the cluster’s dark matter distribution.
The image also includes RELICS data, underscoring the cluster’s value for studying distant galaxies.

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DT Editorial Team·Jun 29, 2026·via universetoday.com

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MXDFz4.4 has helped a team of astronomers to understand a little more about the evolution of the universe (Credit : NASA)

Hubble Spots Early Galaxy That May Have Helped Clear Cosmic Fog

Astronomers detected ionising light from galaxy MXDFz4.4 as it appeared 1.4 billion years after the big bang.
The observation pushes earlier the known frontier for galaxies seen leaking radiation that can ionise hydrogen.
Researchers describe the galaxy as much smaller than the Milky Way but forming stars far faster.
Hubble, JWST and the Very Large Telescope were used together to identify and characterize the object.

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DT Editorial Team·Jun 26, 2026·via universetoday.com

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Image of the Gamma Ray Sky according to the Fermi Large Area Telescope. Credit - NASA/DOE/Fermi LAT Collaboration

Gamma-Ray Background Study Tightens the Case Against Asteroid-Mass Primordial Black Holes

Researchers modeled the gamma-ray signature expected from asteroid-mass primordial black holes.
The analysis compares that prediction with the diffuse extragalactic gamma-ray background.
The reported result narrows the case for this mass range as a dark matter candidate.

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DT Editorial Team·Jun 22, 2026·via universetoday.com

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Some of the earliest galaxies that cosmologists have yet to detect. Credit: ESA/Hubble, NASA, HST Frontier Fields.

Cosmic Dawn Within Reach: JWST Reveals Universe's First Stars

JWST survey of 0.6 sq deg sky shows steep drop in galaxy formation at 150-200 Myr after Big Bang.
Cosmologist Richard Ellis (UCL) has been studying distant universe for 58 years.
Early galaxies are tiny, 30x smaller than Milky Way, only 60-70 ly across.
Study published in Monthly Notices of the Royal Astronomical Society (2026).

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DT Editorial Team·Jun 11, 2026·via universetoday.com

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To discover new physics, AI may need to 'unlearn' the old one

AI May Need to 'Unlearn' Old Physics to Discover New Cosmic Laws

Transfer learning can reduce computational cost of cosmological simulations by up to 90%.
AI systems pretrained on standard ΛCDM model may become biased and miss signs of new physics.
Study published in Journal of Cosmology and Astroparticle Physics uses Quijote simulations.
Researchers suggest developing methods to help AI 'unlearn' irrelevant knowledge.

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DT Editorial Team·Jun 10, 2026·via phys.org

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A section of the COSMOS-Web map, zoom x4. Credit: COSMOS-Web Collaboration.

JWST map traces the cosmic web back toward the universe’s first billion years

Researchers used JWST data to create a highly detailed map of the cosmic web.
The map traces structure back to around 1 billion years after the Big Bang.
COSMOS-Web is the largest of Webb’s Cycle 1 General Observation programs.

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DT Editorial Team·Jun 5, 2026·via universetoday.com

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A deep space photo with a boxout to the left encircling a smear of blue and purple light.

James Webb Spots a Remarkably Primitive Early Galaxy

Astronomers identified LAP1-B as the most metal-poor early-universe galaxy observed so far.
The galaxy dates to roughly 800 million years after the Big Bang.
Webb spectroscopy and gravitational lensing enabled the characterization.

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DT Editorial Team·Jun 1, 2026·via livescience.com

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This artist's illustration shows a supermassive black hole (SMBH) in the early Universe. The JWST found galaxies in the very early Universe that were extremely massive compared to their host galaxies. New research has an explanation for those puzzling findings. Image Credit: NOIRLab/NSF/AURA/J. da Silva (Spaceengine)

A new theory aims to explain why JWST keeps finding oversized black holes in the early universe

JWST found early galaxies with black holes far larger than expected relative to host mass.
A new paper proposes an explanation for these overmassive black hole galaxies.
The findings challenge standard ideas of synchronized galaxy and black hole growth.

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DT Editorial Team·May 19, 2026·via universetoday.com

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Roger Penrose, who pointed out that Hawking's prediction of a smooth, low-entropy early universe was less a prediction than an assumption baked in from the start. (CC BY-SA 2.0, Solarflare100 / Wikimedia Commons)

Why the 'no-boundary' universe remains unresolved even decades after Hawking

The no-boundary proposal still lacks support from a finished theory of quantum gravity.
The model’s most probable universe appears somewhat smaller and less inflationary than the observed cosmos.
Critics argue the proposal may assume, rather than explain, the low-entropy early universe.

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DT Editorial Team·May 19, 2026·via universetoday.com

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This illustration shows the early Universe's progression into the Epoch of Reionization. This is when the first stars and galaxies ionized hydrogen and changed the Universe from opaque to translucent. The new TIME instrument is poised to study this time with a new technique. Image Credit: ESA / C. Carreau. LICENCE: ESA Standard Licence

TIME begins probing the early universe with line-intensity mapping

TIME is mounted on a 12-meter radio telescope at Kitt Peak Observatory.
The instrument uses line-intensity mapping to gather light from many faint galaxies at once.
Researchers have released the first results from the instrument’s commissioning observations.

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DT Editorial Team·May 18, 2026·via universetoday.com

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JWST’s New Cosmic Web Map Traces the Universe’s Hidden Framework in Unprecedented Detail

Astronomers used JWST survey data to build the most detailed map yet of the cosmic web.
The reconstruction links galaxy evolution to the universe’s large-scale structure across deep time.
The work gives researchers a stronger observational basis for testing models of cosmic growth.

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DT Editorial Team·May 18, 2026·via livescience.com

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John Wheeler (right) with Carl Friedrich von Weizsäcker, Bengt Strömgren, and Stefan Rozental in 1963. Wheeler co-developed the equation that treats the entire universe as a quantum object. (Public domain, Niels Bohr Library &amp; Archives)

A quantum-cosmology classic is back in the spotlight as physicists revisit the universe's beginning

Universe Today revisits the singularity problem and why general relativity fails at the universe's apparent beginning.
The article highlights the Wheeler-DeWitt equation as an early attempt to treat the entire universe as a quantum object.
It sets up Stephen Hawking's later argument that the question of a beginning may itself break down under quantum cosmology.

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DT Editorial Team·May 16, 2026·via universetoday.com

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A simulation of the formation of dark matter structures from the early universe until today. Credit: Ralf Kaehler/SLAC National Accelerator Laboratory/American Museum of Natural History

New dark matter model aims to connect three long-standing cosmic puzzles

A UC Riverside-led study proposes self-interacting dark matter as a common explanation for three anomalies.
The model focuses on dense compact cores created through gravothermal collapse.
The idea could connect observations from gravitational lenses, stellar streams, and satellite systems.

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DT Editorial Team·May 16, 2026·via universetoday.com

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A map of the quasars, galaxies, and stars that DESI mapped out over the course of its five year survey. Credit - DESI collaboration and KPNO/NOIRLab/NSF/AURA/R. Proctor

DESI Finishes Its Largest 3D Map Yet and Deepens Questions About Dark Energy

DESI completed its five-year main survey on April 14 after mapping 47 million galaxies and quasars.
The instrument outperformed its original target of more than 34 million galaxies.
Early DESI results hint dark energy may evolve over time rather than remain constant.

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DT Editorial Team·Apr 29, 2026·via universetoday.com

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A ball of yellow and pink sits behind a wall of pink gas with ripples of black and green gridded fabric in the foreground.

AI Cosmology Tool Promises Sharper View of How the Universe Changes

Researchers describe a new AI approach intended to improve reconstruction of cosmic change from observational data.
The method targets a known weakness in genetic algorithms: unstable estimates of derivatives and other nonobservable quantities.
If validated, the technique could strengthen tests of the standard cosmological model and help probe unresolved tensions in the field.

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DT Editorial Team·Apr 28, 2026·via livescience.com

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Researchers are using DESI’s huge 3D map to study dark energy. Earth is at the center of this map, and every point is a galaxy. (Credit: DESI collaboration and KPNO/NOIRLab/NSF/AURA/R. Proctor)

DESI’s 47 Million-Galaxy Map Pushes Dark Energy Research Into a New Scale

DESI has produced the largest 3D map of the universe described in the source material.
The survey uses galaxy positions and distance measurements to trace dark matter-linked cosmic structure.
Researchers are using the data to probe dark energy, with observations set to continue through 2028.

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DT Editorial Team·Apr 28, 2026·via universetoday.com

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