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Galaxies

All articles tagged with #galaxies

Hubble's Blank-Sky Gamble Unveils a Cosmic Forest of Galaxies
space4 days ago

Hubble's Blank-Sky Gamble Unveils a Cosmic Forest of Galaxies

In 1995, the Hubble Space Telescope stared for ten days at a deliberately empty patch of sky in Ursa Major, assembling 342 exposures and over 100 hours of data to produce the Deep Field image. Despite initial resistance and Hubble’s repair history, the image revealed roughly 3,000 faint, distant galaxies, supporting a picture of galaxy formation through mergers and growth. The data were released openly, catalyzing a standard approach and leading to even deeper fields with Hubble and, later, the James Webb Space Telescope.

via Space Daily|
#astronomy#deep-field#galaxies
James Webb spots the Squid Galaxy’s glowing core
space6 days ago

James Webb spots the Squid Galaxy’s glowing core

NASA’s James Webb Space Telescope captured a breathtaking image of Messier 77 (the Squid Galaxy), highlighting a bright core and radiating light beams. The glow is powered by gas heated by a central black hole; some rays are optical artifacts of the telescope. M77 sits about 47 million light-years away in Cetus and has a magnitude around 9.6, making it visible with modest telescopes.

via Space|
#black-hole#galaxies#james-webb-space-telescope
JWST paints a dusty, star-forming portrait of the Whirlpool Galaxy
space14 days ago

JWST paints a dusty, star-forming portrait of the Whirlpool Galaxy

NASA’s James Webb Space Telescope captured a near-infrared view of Messier 51, the Whirlpool Galaxy, revealing dusty spiral arms and active star formation in a portion of the galaxy. The image, taken with JWST’s Near-Infrared Camera (NIRCam), shows M51 located about 31 million light-years away in Canes Venatici, with the full galaxy spanning roughly 76,900 light-years across. This infrared perspective lets astronomers see through dust that obscures visible light and highlights JWST’s ability to map star formation in nearby galaxies.

via Space|
#astronomy#galaxies#james-webb-space-telescope
Backyard telescope captures The Eyes in Markarian's Chain
space14 days ago

Backyard telescope captures The Eyes in Markarian's Chain

Astrophotographer Ronald Brecher captured a striking image of Markarian's Chain—an extended string of galaxies in the Virgo Galaxy Cluster—from his home in Guelph, Canada, using a Skywatcher Esprit 120 and multiple filters to accumulate about 9.5 hours of exposure. The shot highlights the galaxy pair NGC 4438/NGC 4435, nicknamed 'The Eyes', with nearby ellipticals M86 and M84 also visible; Markarian's Chain is a dense segment of the roughly 2,000-member Virgo Cluster. Brecher captured the image between April 17 and 27, and the article explains how to spot Markarian's Chain in spring skies: find Leo's Denebola and Virgo's Vindemiatrix and sweep a 6-inch telescope to the patch between them.

via Space|
#astrophotography#eyes-galaxies#galaxies
JWST Maps the Cosmic Web in Unprecedented Detail Across Cosmic Time
science15 days ago

JWST Maps the Cosmic Web in Unprecedented Detail Across Cosmic Time

Using the James Webb Space Telescope’s COSMOS-Web survey, researchers produced the sharpest map yet of the universe’s cosmic web by charting about 164,000 galaxies, tracing large-scale structures back to when the universe was roughly 1 billion years old. The map reveals dense filaments and voids and will help study how galaxies evolve within this cosmic skeleton; the data are publicly released for wider use.

via ScienceDaily|
#cosmic-web#cosmos-web#galaxies
Five-Year Sky Survey Maps 47 Million Galaxies to Probe Dark Energy
space16 days ago

Five-Year Sky Survey Maps 47 Million Galaxies to Probe Dark Energy

The Dark Energy Spectroscopic Instrument (DESI) completed the most detailed cosmic survey to date, mapping more than 47 million galaxies and quasars across about 14,000 square degrees to create a 3D map of the universe. The dataset aims to test whether dark energy evolves over time and will be analyzed further before broader public access, with future observations planned to extend the coverage and duration into the 2030s.

via The Daily Galaxy|
#astronomy#cosmology#dark-energy
Ancient Giant Galaxy Lacks Spin, Stuns Astronomers
space20 days ago

Ancient Giant Galaxy Lacks Spin, Stuns Astronomers

Astronomers using the James Webb Space Telescope (MAGAZ3NE) found the massive early-universe galaxy XMM-VID1-2075 with essentially no rotation—a surprising 'slow rotator' for its age less than 2 billion years after the Big Bang—likely due to a past major collision or interactions that canceled angular momentum; researchers are expanding the search for similar spinless galaxies to test current galaxy-formation theories.

via ScienceDaily|
#early-universe#galaxies#james-webb-space-telescope
New self-interacting dark matter could solve three cosmic mysteries
space21 days ago

New self-interacting dark matter could solve three cosmic mysteries

A new self-interacting dark matter theory proposes that dark matter particles collide with one another to form dense cores, potentially explaining three puzzling observations: an ultradense dark matter clump in the gravitationally lensed system JVAS B1938+666, a visible “scar” in the GD-1 stellar stream, and the unusual formation of the Fornax 6 star cluster in the Milky Way’s Fornax dwarf galaxy. The mechanism, related to gravothermal collapse, could unify these disparate clues across cosmic scales in a way standard collisionless dark matter cannot.

via Space|
#cosmology#dark-matter#galaxies
Early galaxies burned bright with fresh gas, reshaping our cosmic origin story
space23 days ago

Early galaxies burned bright with fresh gas, reshaping our cosmic origin story

New JWST observations and ColdSIM simulations show that the first galaxies in the early universe formed stars at a frantic pace using pristine gas rather than recycling material. The simulations reveal a shift from cold, dense gas to a warm, low-density phase during the epoch of reionization, plus a surprisingly low stellar return fraction. As a result, these infant galaxies depleted their gas quickly, implying a more aggressive, gas‑driven mode of star formation than current models predict. This work reshapes our understanding of cosmic origins and will be tested further by JWST and future facilities like the Square Kilometre Array.

via Space|
#baryon-budget#early-universe#epoch-of-reionization
DESI's 3D Universe Map Charts 47 Million Galaxies to Probe Dark Energy
space1 month ago

DESI's 3D Universe Map Charts 47 Million Galaxies to Probe Dark Energy

The Dark Energy Spectroscopic Instrument (DESI) has produced the largest high‑resolution 3D map of the universe, cataloging about 47 million galaxies (and more than 20 million nearby stars) into a cosmic web of filaments and voids. By mapping galaxy positions over roughly 11 billion years, scientists aim to understand how dark energy shapes cosmic expansion; DESI will continue observations through 2028 to expand the map by ~20%, with first full dataset results expected in 2027.

via Live Science|
#cosmology#dark-energy#desi
Cosmic Census Reaches New Depths: DESI Unveils the Largest 3D Map, Hinting Dark Energy Might Evolve
science1 month ago

Cosmic Census Reaches New Depths: DESI Unveils the Largest 3D Map, Hinting Dark Energy Might Evolve

The Dark Energy Spectroscopic Instrument (DESI) has produced the universe’s largest 3D map, cataloging 47 million galaxies and quasars—well above its target—across five years. Published in Astronomy & Astrophysics, the data could prompt a major shift in cosmology, with early results suggesting dark energy may not be constant and could be weakening the universe’s acceleration, challenging the standard LCDM model.

via The Daily Galaxy|
#3d-map#cosmology#dark-energy