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Largest 3D Map of the Universe Reveals 47 Million Galaxies

Largest 3D Map of the Universe Reveals 47 Million Galaxies

The Dark Energy Spectroscopic Instrument (DESI) has created the largest-ever 3D map of the universe, showcasing 47 million galaxies. This map, developed over five years, provides a detailed view of the universe's large-scale structure, including the cosmic web of galaxies and voids. DESI, located at the Kitt Peak National Observatory in Arizona, uses advanced fiber-optic sensors to capture light from distant celestial objects. The map not only illustrates the distribution of galaxies but also offers insights into the universe's evolution and the role of dark energy.
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DESI Completes Largest 3D Map of Universe, Illuminating Dark Energy Mysteries

DESI Completes Largest 3D Map of Universe, Illuminating Dark Energy Mysteries

The Dark Energy Spectroscopic Instrument (DESI) has completed the most comprehensive 3D map of the universe, significantly advancing the understanding of dark energy. Over five years, DESI mapped 47 million galaxies and quasars, surpassing its original target. This achievement, published in the Astronomy & Astrophysics journal, provides unprecedented insights into the universe's expansion and the mysterious force of dark energy. DESI's data fills gaps left by previous cosmological probes, offering new sensitivity to study dark energy's nature. The findings suggest potential shifts in the standard cosmological model, indicating that dark energy may fluctuate in strength, challenging existing theories.
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DESI Completes Largest 3D Map of the Universe, Advances Dark Energy Research

DESI Completes Largest 3D Map of the Universe, Advances Dark Energy Research

The Dark Energy Spectroscopic Instrument (DESI) has successfully completed the largest high-resolution 3D map of the universe, marking a significant milestone in the study of cosmic expansion. DESI's 5,000 fiber-optic sensors captured their final observations, focusing on a region near the Little Dipper. This project, involving global institutions such as the University of Portsmouth and Berkeley Lab, has exceeded its data collection goals, providing more information than initially projected. The data is being used to investigate dark energy, a mysterious force constituting about 70% of the universe, which drives its accelerating expansion. Early results suggest that dark energy might be evolving over time, challenging the long-held belief of it being a cosmological constant.
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DESI Completes 3D Universe Map, Advances Dark Energy Research

DESI Completes 3D Universe Map, Advances Dark Energy Research

The Dark Energy Spectroscopic Instrument (DESI) has successfully completed the largest high-resolution 3D map of the universe, marking a significant milestone in understanding cosmic expansion. The project, involving over 900 researchers from more than 70 institutions worldwide, including the University of Portsmouth and Berkeley Lab, has surpassed its original goals by capturing data from over 47 million galaxies and quasars. This extensive dataset is being used to investigate dark energy, a mysterious force that constitutes about 70% of the universe and drives its accelerating expansion. Early results suggest that dark energy might be evolving over time, challenging the long-held belief of it being a 'cosmological constant'. The completion of this map allows researchers to trace dark energy's influence over 11 billion years of cosmic history.
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University of Chicago Students Discover Ancient Star with Minimal Metal Content in Milky Way

University of Chicago Students Discover Ancient Star with Minimal Metal Content in Milky Way

A group of students from the University of Chicago has discovered an ultra-ancient star, SDSS J0715-7334, within the Milky Way. This star is unique due to its minimal metal content, consisting mostly of hydrogen and helium. The discovery was made using data from the Sloan Digital Sky Survey (SDSS), which helps scientists study the evolution of stars and galaxies. The star is believed to have originated in the Large Magellanic Cloud, a neighboring galaxy, and drifted into the Milky Way billions of years ago. This finding provides insight into the conditions of the early universe, as the star formed long before most supernovae, which are responsible for creating heavier elements.
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University of Chicago Students Discover Ancient Star with Minimal Metals in Milky Way

University of Chicago Students Discover Ancient Star with Minimal Metals in Milky Way

A group of students from the University of Chicago has discovered an ultra-ancient star, SDSS J0715-7334, in the Milky Way that is almost devoid of metals. This star, which formed in another galaxy, was identified using data from the Sloan Digital Sky Survey (SDSS). The star's lack of heavy elements suggests it is one of the oldest and most pristine stars ever observed. The discovery was made during an astronomy class led by Professor Alex Ji, where students were tasked with examining thousands of stars. The star's unique characteristics indicate it originated in the Large Magellanic Cloud and later drifted into the Milky Way.
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Astronomers Identify Sympathetic Flares on Distant Stars, Expanding Stellar Phenomena Understanding

Astronomers Identify Sympathetic Flares on Distant Stars, Expanding Stellar Phenomena Understanding

A team of researchers from Tufts University has discovered that sympathetic flares, a solar phenomenon previously observed only on the Sun, are common among distant stars. This finding, published in The Astrophysical Journal, marks a significant advancement in the understanding of stellar phenomena. Sympathetic flares occur when a secondary flare is triggered by an initial eruption, creating a ripple effect. The study revealed that this phenomenon is not exclusive to the Sun but is present in over 16,000 stars, including Sun-like giants and M dwarfs, the most common stars in the Milky Way. The research team developed a novel algorithm, TOFFEE, to analyze over 200,000 flares across these stars, distinguishing between unrelated flares and those triggered by a prior flare.
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University of Chicago Students Discover Ancient Star in Milky Way

University of Chicago Students Discover Ancient Star in Milky Way

A team of undergraduate students from the University of Chicago has discovered an ancient star with almost no heavy elements, indicating it is one of the most pristine stars ever found. The star, identified using data from the Sloan Digital Sky Survey (SDSS), is believed to have formed in a nearby galaxy before migrating into the Milky Way. This discovery was made during a field course in astrophysics, where students analyzed data and conducted observations at the Las Campanas Observatory in Chile. The star's low metallicity suggests it formed very early in the universe's history, providing valuable insights into the conditions of the early cosmos.
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Supermassive Black Holes in Markarian 501 Predicted to Collide Within a Century

Supermassive Black Holes in Markarian 501 Predicted to Collide Within a Century

Astronomers have identified two supermassive black holes in the galaxy Markarian 501, located 500 million light-years away, that are on a collision course. Using radio telescope data, researchers discovered that the galaxy's bright core, previously thought to be a blazar, is actually powered by two black holes. These black holes are expected to merge within the next 100 years, potentially releasing powerful gravitational waves detectable on Earth.
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NASA's SPHEREx Observatory Maps Interstellar Ice in the Milky Way

NASA's SPHEREx Observatory Maps Interstellar Ice in the Milky Way

NASA's SPHEREx observatory has successfully mapped interstellar ice in the Milky Way, revealing chemical signatures of water ice and polycyclic aromatic hydrocarbons in the Cygnus X region. This observation, released on April 15, 2026, highlights one of the most active star-forming areas in our galaxy. SPHEREx, launched in March 2025, is designed to map chemical signatures of various interstellar ices, including water, carbon dioxide, and carbon monoxide. These molecules are crucial for the chemistry that supports life development. The observatory's ability to see the sky in 102 colors allows it to gather unique data on galaxies, stars, and other cosmic features.
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NASA's Roman Space Telescope to Map Dark Matter and Energy Through Weak Lensing

NASA's Roman Space Telescope to Map Dark Matter and Energy Through Weak Lensing

NASA's Nancy Grace Roman Space Telescope is set to study the universe's dark matter and energy by observing weak gravitational lensing. This phenomenon occurs when massive objects like galaxy clusters warp space-time, bending the path of light from distant galaxies. Roman's sensitivity will allow it to map the distribution of both visible and dark matter across the universe. By analyzing how gravity distorts light, scientists aim to create a detailed map of cosmic matter, providing insights into the universe's structure and evolution. The telescope's observations will also contribute to understanding dark energy, which influences the universe's expansion.
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Methane Detected from Interstellar Comet 3I/ATLAS as It Exits Solar System

Methane Detected from Interstellar Comet 3I/ATLAS as It Exits Solar System

The interstellar comet 3I/ATLAS, which originated from outside our solar system, is now leaving after a brief visit. Using the James Webb Space Telescope, researchers at Caltech have detected methane emissions from the comet as it exits. This comet, over a kilometer wide, has been traveling through the galaxy for at least a billion years. The study of its mid-infrared signatures has provided insights into the distant environment where it formed. The comet's surface, irradiated by cosmic rays, began emitting methane as it was warmed by the sun, revealing its inner icy layers.