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Canadian Researchers Propose Alternative Cosmological Model Challenging Dark Matter and Dark Energy

Canadian Researchers Propose Alternative Cosmological Model Challenging Dark Matter and Dark Energy

Canadian researchers, including physicists Rajendra Gupta and Nikolaos Samaras from the University of Ottawa, have developed an alternative cosmological model called CCC+TL, which challenges the standard model's reliance on dark matter and dark energy. This new model combines the Covarying Coupling Constants and 'Tired Light' hypotheses, suggesting that fundamental physical constants can change over time and photons lose energy as they travel through space. According to this theory, phenomena typically attributed to dark matter and dark energy could be explained by these changing constants, eliminating the need for additional invisible components. The CCC+TL model estimates the age of the universe at 26.7 billion years, nearly double the standard model's estimate of 13.8 billion years. The researchers have tested their model against various astronomical observations, including primary nucleosynthesis, cosmic chronometers, and galaxy rotation curves, with some promising initial results.

Roman Space Telescope Offers 100-Fold Wider Field of View Compared to Hubble

Roman Space Telescope Offers 100-Fold Wider Field of View Compared to Hubble

The Roman Space Telescope, formerly known as WFIRST (Wide Field Infrared Survey Telescope), possesses a field of view that is 100 times greater than that of the Hubble Space Telescope. This significant advancement allows Roman to capture vast areas of the sky in a single observation. For instance, when observing the Pillars of Creation in the Eagle Nebula, Hubble can only focus on the pillars themselves. In contrast, Roman can simultaneously image the pillars along with substantial portions of the surrounding nebula. This capability enables a much broader survey of celestial objects and phenomena, providing a more comprehensive context for detailed observations. The European Space Agency (ESA) has highlighted this comparative advantage, indicating Roman's potential to revolutionize wide-field infrared astronomy.

NASA's Hubble and Roman Telescopes Collaborate to Study Gravitational Lensing and Dark Matter

NASA's Hubble and Roman Telescopes Collaborate to Study Gravitational Lensing and Dark Matter

NASA's Hubble Space Telescope and the newly launched Nancy Grace Roman Space Telescope are collaborating to study gravitational lensing, a phenomenon where massive objects bend and magnify light from distant galaxies. Hubble has captured a diverse gallery of gravitational lenses, which will serve as targets for follow-up observations by Roman. Gravitational lensing allows astronomers to view objects much farther away and helps in understanding the distribution of mass, including invisible dark matter, in foreground galaxies. While Hubble provides high-resolution views in visible and ultraviolet light, Roman, primarily observing in infrared, offers a much wider field of view, enabling it to capture more lenses. This collaborative approach aims to build a comprehensive picture of the cosmos and test theories about dark matter.

ESA's Euclid Space Telescope Releases Massive 500-Gigapixel Northern Sky Mosaic

ESA's Euclid Space Telescope Releases Massive 500-Gigapixel Northern Sky Mosaic

The European Space Agency (ESA) has released a nearly 500-gigapixel mosaic of the northern sky, compiled from observations by its Euclid space telescope. This extensive mosaic is part of Euclid's first major data release, DR1-Foundation, which is based on data collected in autumn 2024 and spring 2025. The mosaic covers 367 square degrees of the northern sky and includes 740 individual observations. A notable feature within this mosaic is the spiral galaxy Messier 81, located approximately 12 million light-years away. Euclid's advanced optics were able to capture individual stars within Messier 81, which is situated at the center of a group of about 38 galaxies. The image combines data from VIS and NISP photometry in Y, J, and H bands, using blue, green, and red channels to represent different wavelengths. Small black rectangular gaps are present in the mosaic, indicating regions intentionally avoided during the survey due to the presence of very bright stars that could interfere with Euclid's sensitive ins...

Hubble Telescope Images Gravitational Lenses to Test Dark Matter Theories

Hubble Telescope Images Gravitational Lenses to Test Dark Matter Theories

NASA's Hubble Space Telescope has captured a diverse collection of gravitational lenses, which are being used to test theories about dark matter, specifically the cold dark matter theory. Gravitational lensing occurs when the gravity of a massive foreground object, like a galaxy, bends and magnifies light from a more distant background object. Researchers are using these high-resolution images to detect small imperfections in the lensed galaxy arcs, which could indicate the presence of small clumps of dark matter. The cold dark matter theory predicts the existence of many such clumps, ranging from a million to a billion solar masses. By studying the distortion of these lensed galaxies, astronomers can determine the quantity and distribution of mass in the foreground galaxy, including its invisible dark matter. These observations are also laying the groundwork for follow-up studies by the new Nancy Grace Roman Space Telescope, which launched in August 2026, and will help in building an AI tool for efficient...

Simulation Reveals Black Hole Jets in Centaurus A Glow Brightest at Edges Due to Electron Movement

Simulation Reveals Black Hole Jets in Centaurus A Glow Brightest at Edges Due to Electron Movement

Astronomers at the University of Würzburg have utilized a computer simulation to replicate the appearance of the black hole jet in the nearby galaxy Centaurus A, as observed by the Event Horizon Telescope. The simulation, detailed in a study published in Astronomy & Astrophysics, indicates that the jet's edges glow more brightly than its center. This phenomenon, known as edge brightening or limb brightening, is attributed to electrons predominantly moving along magnetic field lines rather than in all directions. Centaurus A, located approximately 12 million light-years from Earth, hosts the closest radio galaxy to our planet. The Event Horizon Telescope, a global network of radio dishes, captured an image of its jet base in 2021, which showed emission concentrated along the outer edges. The new model fits a physical explanation to this observation, suggesting that electrons in the dilute, strongly magnetized central spine of the jet lose energy faster, and those moving along magnetic field lines radiate le...

Hubble Reveals 'Cat's Tail' Dust Cloud Around Beta Pictoris, Offering Insights into Early Solar Systems

Hubble Reveals 'Cat's Tail' Dust Cloud Around Beta Pictoris, Offering Insights into Early Solar Systems

New observations from the Hubble Space Telescope have provided a clearer picture of the 'Cat's Tail,' a trail of soot-dark dust around the young star Beta Pictoris, located 63 light-years away. The study, led by University of Arizona doctoral student Arin Avsar, indicates that this dust structure lies mostly flat against the sky from Earth's perspective and is composed almost entirely of porous, carbon-rich grains. These grains are believed to have formed from a collision between two Pluto-sized bodies. The Cat's Tail was initially discovered in 2024 by NASA's James Webb Space Telescope, which detected it in mid-infrared light. Hubble's visible-light images, combined with Webb's infrared data and computer modeling, helped reconstruct the tail's three-dimensional arrangement, revealing its flat orientation and fluffy, carbon-rich composition.

Researchers Discover Rare Star System Emitting Radio Signals Every Eight Minutes

Researchers Discover Rare Star System Emitting Radio Signals Every Eight Minutes

Scientists at the Curtin University node of the International Centre for Radio Astronomy Research (ICRAR) have identified a unique star system, GPM J071507−114153, that emits radio pulses every eight minutes. This system comprises a white dwarf, which is the dense remnant of a dead star, orbiting a G-type star similar to our Sun. This discovery marks the first time radio pulses have been detected from a white dwarf in orbit with a Sun-like star; typically, such pulses are observed in systems involving smaller, cooler red dwarf stars. Lead author Dr. Sam McSweeney, a commissioning scientist with the Square Kilometre Array Observatory, confirmed that the pulsations originate from near or on the white dwarf itself, based on clear orbital movement. Associate Professor Natasha Hurley-Walker, a co-author, noted that these pulses allowed the team to detect stellar flares on the Sun-like star and observe a 'stellar prominence'—a large loop of plasma—as the white dwarf passed behind it. The detection involved exten...

NASA Ames Recognizes Employees for Contributions to Space Biosciences, Astrophysics, and Earth Science

NASA Ames Recognizes Employees for Contributions to Space Biosciences, Astrophysics, and Earth Science

NASA Ames Science Directorate has recognized three individuals as 'Stars of the Month' for November 2026: Alyssa Villanueva, Steve Howell, and Samuel LeBlanc. Alyssa Villanueva, an engineer at Blue Marble in the Space Biosciences Division, is honored for her technical excellence and dedication to the LEIA (Lunar Explorer Instrument for space biology Applications) team, particularly in engineering validation testing. Steve Howell is recognized for his leadership in scientific teams for international space missions and his pioneering work in astronomical instrumentation, which has significantly advanced telescope imaging. He recently received the Catherine Wolfe Bruce Gold Medal from the Astronomical Society of the Pacific for his lifetime contributions. Samuel LeBlanc, a research scientist for the Bay Area Environmental Research Institute in the Earth Science Division, is acknowledged for his technical leadership and innovative thinking in advancing Ames’ flight planning capabilities for NASA airborne scien...

Euclid Space Telescope Releases Unprecedented Data, Advancing Cosmology Research

Euclid Space Telescope Releases Unprecedented Data, Advancing Cosmology Research

The European Space Agency's (ESA) Euclid space telescope has released its first major dataset, providing an unprecedented view of the Universe. This initial release includes images covering an area of sky nearly 10,000 times the size of the full Moon, containing approximately 900 million galaxies and 60 million quasars. The dataset comprises about 2.5 trillion pixels and 1.7 million gigabytes of data. Launched on July 1, 2023, Euclid's mission is to create the largest and most detailed map of the Universe ever made. According to Leiden astronomer Koen Kuijken, Euclid is a wide-field telescope, capturing over a hundred times more sky in a single image than the Hubble or James Webb Space Telescopes. It produces around 20 new images daily and aims to map a third of the entire sky over its six-year mission. These observations allow astronomers to look far back in time, with some galaxies in the dataset existing when the Universe was only 700 million years old.

Euclid mission data release spans more than 900 million galaxies

Euclid mission data release spans more than 900 million galaxies

By Will Dunham Nov 12 (Reuters) - The European Space Agency has released its first big collection of data from the orbiting Euclid telescope's mission to map the universe's large-scale structure, including observations of more than 900 million galaxies, as scientists investigate the puzzling cosmic

Independent Re-analysis Confirms M87* Black Hole's Iconic Ring Shape, Validating General Relativity

Independent Re-analysis Confirms M87* Black Hole's Iconic Ring Shape, Validating General Relativity

A new, independent re-analysis of data from the Event Horizon Telescope (EHT) has confirmed the iconic ring structure of the M87* black hole, originally imaged in 2019. This re-analysis, conducted by a research team led by Samuel Lai of Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO), utilized an original image-reconstruction method combining 'closure invariants' with generative AI. The study, published in Nature on November 11, 2026, stably reproduced a ring structure approximately 42 microarcseconds in diameter, consistent with the initial EHT findings. This confirmation addresses previous skepticism regarding the image's reliance on specific processing methods and reinforces the accuracy of general relativity in describing spacetime around black holes.