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Dark Energy

All articles tagged with #dark energy

DESI's 47-Million Galaxy Map Challenges Standard Cosmology
science9 days ago

DESI's 47-Million Galaxy Map Challenges Standard Cosmology

The Dark Energy Spectroscopic Instrument (DESI) has completed its first five-year survey, producing the largest high-resolution 3D map of the universe to date. Covering 47 million galaxies and quasars across 11 billion years of cosmic history, the dataset is six times larger than all previous measurements combined. While the data initially aligned with the standard cosmological model, it required parameter values that differed from expectations, suggesting potential issues with the cosmological constant. This finding, though not yet statistically definitive, has sparked significant debate within the physics community regarding the nature of dark energy and the universe's expansion.

via Gizmodo|
#astronomy#cosmology#dark-energy
space18 days ago

Cosmic Acceleration Under Scrutiny: New Supernova Catalog Hints Dark Energy May Evolve

A record 2,884 Type Ia supernovae form the largest catalog to date, integrated with DES data and reanalyzed across telescopes to create a consistent history of cosmic expansion; the results add to hints that dark energy may vary over time, challenging the standard constant-dark-energy model and aligning with DESI signals, with future surveys like DEBASS expected to provide further clarity.

via SciTechDaily|
#cosmology#dark-energy#dark-energy-survey
astronomy26 days ago

Cosmic Acceleration Persists as New Analysis Reaffirms Dark Energy

An international team finds the universe’s expansion continues to accelerate, refuting a recent claim of slowing growth. By re-calibrating Type Ia supernovae to host galaxy age and mass, the study shows the previous measurements remain robust and dark energy still explains cosmic acceleration; the work counters a South Korean study and reinforces the legacy of Riess, Schmidt and Perlmutter. Published in Monthly Notices of the Royal Astronomical Society.

via SciTechDaily|
#astronomy#cosmic-acceleration#cosmic-expansion
Cosmic Clues Suggest Dark Energy May Evolve Over Time
science1 month ago

Cosmic Clues Suggest Dark Energy May Evolve Over Time

Astronomers compiled a catalog of nearly 3,000 Type Ia supernovae from the Dark Energy Survey and DESI data, finding hints that dark energy’s influence on cosmic expansion may change over time, challenging the standard model that assumes a fixed dark energy. By integrating three decades of observations into a single framework, the study suggests a possible link between gravity and quantum physics and points to future data from the DEBASS program to clarify whether dark energy evolves.

via Space|
#cosmology#dark-energy#desi
New analysis hints the universe isn’t accelerating after all
science1 month ago

New analysis hints the universe isn’t accelerating after all

A reanalysis of Pantheon+ Type Ia supernovae, including a correction for the ages of progenitor stars, finds the cosmic expansion may be slowing instead of accelerating and that the apparent acceleration varies with direction. This challenges the dark energy paradigm, though other studies still support acceleration. The Rubin Observatory’s LSST is expected to provide a decisive test with a much larger supernova sample.

via Science Daily|
#anisotropy#cosmic-acceleration#dark-energy
Hidden Dimension May Tie Dark Energy and Dark Matter Together
science1 month ago

Hidden Dimension May Tie Dark Energy and Dark Matter Together

Scientists are exploring the idea that dark energy and dark matter interact through a proposed “dark dimension” from string theory, which could explain a changing dark energy density over time and co-evolving dark-matter mass. DESI data motivate models where their coupling helps address the Hubble tension and could imply a new long-range dark force with observable effects, such as distinctive galactic tidal signatures or signals from gravitons in the dark dimension.

via WIRED|
#cosmology#dark-energy#dark-matter
Roman Space Telescope Launches from Florida to Map Dark Energy and Exoplanets
space1 month ago

Roman Space Telescope Launches from Florida to Map Dark Energy and Exoplanets

At 7:26 a.m. ET, NASA's Nancy Grace Roman Space Telescope lifted off from Kennedy Space Center aboard a SpaceX Falcon Heavy, launching on a mission to study dark energy, discover exoplanets, and survey the sky with a field of view at least 100 times larger than Hubble—the data will be released publicly soon after processing and will supplement, not replace, Hubble and Webb.

via WESH|
#dark-energy#exoplanets#nasa
Roman Space Telescope Sets Course to Find Hidden Worlds and Decode Dark Energy
science1 month ago

Roman Space Telescope Sets Course to Find Hidden Worlds and Decode Dark Energy

NASA's Nancy Grace Roman Space Telescope launched on Aug 30 and is en route to a Sun–Earth Lagrange point, where its coronagraph will directly image exoplanets and its spectroscopy mode will probe atmospheres, while broader sky surveys aim to shed light on dark energy and the fate of the universe, in coordination with Webb, Euclid, Rubin, and Hubble.

via Defector|
#cosmology#dark-energy#exoplanets
NASA's Roman Space Telescope kicks off a sweeping cosmic survey.
space1 month ago

NASA's Roman Space Telescope kicks off a sweeping cosmic survey.

NASA launches the Nancy Grace Roman Space Telescope, a wide-field observatory with a 2.4-meter mirror and a 300-megapixel camera designed to map about 12% of the sky—100 times the field of view of Hubble—surveying billions of galaxies, thousands of exoplanets, and the universe's dark energy and dark matter. It will downlink roughly 1.4 terabytes of data per day (about 20 petabytes over five years) from a Sun-Earth L2 orbit, with a coronagraph for direct exoplanet imaging and first science images expected by year-end.

via Ars Technica|
#dark-energy#dark-matter#exoplanets
NASA's Roman Space Telescope takes off to map exoplanets and dark energy
science1 month ago

NASA's Roman Space Telescope takes off to map exoplanets and dark energy

NASA launched the Nancy Grace Roman Space Telescope from Kennedy Space Center aboard a SpaceX Falcon Heavy, a powerful next‑gen observatory with a field of view about 100 times larger than Hubble and JWST. After a ~100‑day journey to a point roughly one million miles from Earth, it will survey for thousands of exoplanets, map dark matter and dark energy, and study black holes, aiming to revolutionize our understanding of the Universe. The five‑year primary mission could extend to 10 years, with scientists anticipating enormous cosmic maps and new insights into whether we are alone in the cosmos.

via BBC|
#dark-energy#exoplanets#nasa
Cosmic Ledger: Ordinary Matter Accounts for About 5% of the Universe
science1 month ago

Cosmic Ledger: Ordinary Matter Accounts for About 5% of the Universe

Planck-era cosmology shows the present-day mass-energy density is about 4.9% ordinary (baryonic) matter, 26.8% dark matter, and 68.3% dark energy; these figures are model-dependent and reflect the current energy budget rather than a literal inventory, with ordinary matter including stars and gas but most baryons in non-luminous forms. Dark matter exerts gravity without emitting light, while dark energy drives the universe’s accelerated expansion; the three components sum to 100% in the ΛCDM framework, and updates (e.g., Planck 2018) refine the fractions slightly. Ongoing surveys like DESI test these components and potential time variation of dark energy; the standard model remains successful but hypotheses about dark energy and gravity are still under study.

via Space Daily|
#baryonic-matter#cosmology#dark-energy
NASA's Nancy Grace Roman Space Telescope set for Falcon Heavy liftoff
space-exploration1 month ago

NASA's Nancy Grace Roman Space Telescope set for Falcon Heavy liftoff

Space.com provides live updates as NASA's Nancy Grace Roman Space Telescope is scheduled to launch on Aug. 30 at 7:26 a.m. EDT atop SpaceX's Falcon Heavy from Cape Canaveral's LC‑39A, aiming to study dark energy and exoplanets and to reach the Sun–Earth L2 point, with prelaunch briefings and weather reviews underway ahead of liftoff and subsequent checkout.

via Space|
#dark-energy#exoplanets#falcon-heavy
NASA's Trailblazer Gets a Name in the Sky with a New Exoplanet Hunter
space1 month ago

NASA's Trailblazer Gets a Name in the Sky with a New Exoplanet Hunter

NASA is launching the Nancy Grace Roman Space Telescope on Aug 30, 2026, from Kennedy Space Center aboard a SpaceX Falcon Heavy. The 300-megapixel infrared observatory has a field of view at least 100 times larger than Hubble and will survey about 2 billion galaxies to probe dark energy and dark matter while hunting around 100,000 exoplanets (including rogue planets) using a coronagraph to block starlight. It will operate at the Sun–Earth L2 point, stream more than a terabyte of data daily, and cost about $4.3 billion for a five-year mission, continuing NASA’s legacy of space-based astronomy named after its pioneering leader Nancy Grace Roman.

via ABC News - Breaking News, Latest News and Videos|
#dark-energy#exoplanets#nancy-grace-roman
Cosmic Expansion Gap Grows: Dark Energy May Be Evolving
science1 month ago

Cosmic Expansion Gap Grows: Dark Energy May Be Evolving

Two long-standing methods for measuring the universe’s expansion—early-universe data from Planck and local observations of supernovae—remain at odds, a discrepancy known as the Hubble tension. New DESI results, when combined with other probes, hint that dark energy might not be a constant after all, challenging the simplest ΛCDM model. Riess and Leauthaud have warned that the standard cosmology could be cracking, even as some newer analyses (e.g., Lyman-alpha forest data) either align with or complicate this evolving picture. The cosmos’ expansion history thus remains an active, debated frontier.

via All That's Interesting|
#cosmology#dark-energy#desi