This the largest photomosaic ever assembled from NASA/ESA Hubble Space Telescope observations. It is a panoramic view of the neighboring Andromeda galaxy, located 2.5 million light-years away. Image Credit: NASA, ESA, B. Williams (University of Washington)

Hubble’s Largest Image Ever: Andromeda Galaxy Like You’ve Never Seen Before

January 21, 2025
By combining data from the DESI Legacy Imaging Surveys and the Gemini South telescope, astronomers have investigated three ultra-faint dwarf galaxies that reside in a region of space isolated from the environmental influence of larger objects. The galaxies, located in the direction of NGC 300, were found to contain only very old stars, supporting the theory that events in the early Universe cut star formation short in the smallest galaxies. These images were taken for the DECam Legacy Survey (DECaLS), one of three public surveys that jointly imaged 14,000 square degrees of sky to provide targets for the ongoing Dark Energy Spectroscopic Instrument (DESI) Survey. DECals was conducted using the 570-megapixel Department of Energy-fabricated Dark Energy Camera (DECam), mounted on the U.S. National Science Foundation Víctor M. Blanco 4-meter Telescope at Cerro Tololo Inter-American Observatory (CTIO) in Chile, a Program of NSF NOIRLab. Credits: DECaLS/DESI Legacy Imaging Surveys/LBNL/DOE & KPNO/CTIO/NOIRLab/NSF/AURA Image Processing: T.A. Rector (University of Alaska Anchorage/NSF NOIRLab), M. Zamani (NSF NOIRLab) & D. de Martin (NSF NOIRLab) Usage Restrictions

Ghost Town Galaxies Discovered! What They Tell Us About Star Formation

January 20, 2025
Illustration of the expansion of the universe. (Image credit: Mark Garlick/Science Photo Library/Getty Images)

Did Quantum Foam Drive Cosmic Inflation? A Bold New Theory Emerges

January 20, 2025
An artist impression of young star formation in the Large Magellanic Cloud. Massive and low-mass stars appear within nebulous gas within which they are born. Credit: NSF/AUI/NSF NRAO/S.Dagnello

A Rare Celestial Event: Witnessing the Birth of a Super Star Cluster

January 20, 2025
30 of the exocomet belts, as imaged in this study, showing the extreme variation in such belts. Credit: Prof Luca Matra, Trinity College Dublin.

Exploring the Universe’s Ice Rings: The Discovery of 74 Exocomet Belts

January 19, 2025
planets parade. Credit: Stellarium

Six Planets, One Night: A Celestial Show You Can’t Miss!

January 19, 2025
Evolution of a "Blue Lurker" Star in a Triple System. Panel 1: A triple star system containing three sun-like stars. Two are very tightly orbiting. The third star has a much wider orbit. Panel 2: The close stellar pair spiral together and merge to form one more massive star. Panel 3: The merged star evolves into a giant star. As the huge photosphere expands, some of the material falls onto the outer companion, causing the companion to grow larger and its rotation rate to increase. Panels 4–5: The central merged star eventually burns out and forms a massive white dwarf, and the outer companion spirals in towards the white dwarf, leaving a binary star system with a tighter orbit. Panel 6: The surviving outer companion is much like our sun but nicknamed a "blue lurker." Although it is slightly brighter bluer than expected because of the earlier mass-transfer from the central star and is now rotating very rapidly, these features are subtle. The star could easily be mistaken for a normal sun-like star despite its exotic evolutionary history. Credit: NASA, ESA, Leah Hustak (STScI)

The Star That Hid in Plain Sight: Hubble’s Blue Lurker Discovery Explained

January 18, 2025
Artist’s impression of GJ 1214 b passing in front of its host star. The “transit method” allows astronomers to study an exoplanet by seeing which wavelengths of light dim when the star’s light passes through the exoplanet atmosphere. Credit: NAOJ

Discover the New Planet Everyone’s Talking About: GJ 1214 b Revealed by James Webb

January 18, 2025
An illustration of two entangled molecules which are individually trapped in magic-wavelength optical tweezers. Credit: Durham University

Hubble’s V1: The Star That Proved the Universe is Bigger Than We Imagined

January 18, 2025
In commemoration of Edwin Hubble's discovery of a Cepheid variable class star, called V1, in the neighboring Andromeda galaxy 100 years ago, astronomers partnered with the American Association of Variable Star Observers (AAVSO) to study the star. AAVSO observers followed V1 for six months, producing a plot, or light curve, of the rhythmic rise and fall of the star's light. Based on this data, the Hubble Space Telescope was scheduled to capture the star at its dimmest and brightest light. Edwin Hubble's observations of V1 became the critical first step in uncovering a larger, grander universe than some astronomers imagined at the time. Once dismissed as a nearby "spiral nebula" measurements of Andromeda with its embedded Cepheid star served as a stellar milepost marker. It definitively showed that Andromeda was far outside of our Milky Way. Edwin Hubble went on to measure the distances to many galaxies beyond the Milky Way by finding Cepheid variables within those levels. The velocities of those galaxies, in turn, allowed him to determine that the universe is expanding. Credit: NASA, ESA, Hubble Heritage Project (STScI, AURA)

How One Star in Andromeda Redefined Humanity’s Place in the Universe

January 16, 2025
NASA, ESA, and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration. Acknowledgement: Robert A. Fesen (Dartmouth College, USA) and James Long (ESA/Hubble)

See the Universe’s Secret Layers: Webb Telescope’s Latest Unforgettable Images

January 16, 2025
This artist’s impression shows CR7 a very distant galaxy discovered using ESO’s Very Large Telescope. Credit: ESO/M. Kornmesser

Water in the Early Universe? The Surprising Legacy of First Stars

January 16, 2025
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