🔭 Category

astro-ph

164 papers

Astro-Ph explores the fundamental nature of our universe, from the birth of stars and the behavior of black holes to the vast structures of galaxies and the invisible forces shaping cosmic evolution. This dynamic field seeks to answer profound questions about how the cosmos works, blending theoretical models with observations from powerful telescopes that peer back to the dawn of time.

At Gist.Science, we process every new preprint uploaded to arXiv in this category as soon as it appears. Our team transforms these complex research papers into accessible content, offering both detailed technical breakdowns for experts and clear, plain-language summaries for curious minds. This ensures that the latest discoveries in astrophysics are understood by everyone, not just those inside the academic bubble.

Below are the most recent astro-ph preprints, each paired with our comprehensive analysis to help you navigate the cutting edge of cosmic research.

🔭 astrophysics

James Webb Space Telescope (JWST) Galaxies and the "Hawking Star" Hypothesis

This paper proposes that the unexpectedly luminous high-redshift galaxies detected by JWST, such as Jz14, are not massive galaxies challenging standard cosmology but rather dwarf galaxies composed of approximately one million "Hawking Stars"—hypothetical objects where baryonic accretion onto Primordial Black Holes triggers intense nuclear fusion near the event horizon, thereby reconciling the observations with the hierarchical structure formation model.

Sho Kawajiri, Hideyuki Kamaya2026-09-21
🔭 astrophysics

Searching for a geological and atmospheric memory of a past Venusian biosphere with global Magellan surface observables

This study integrates global Magellan surface data with atmospheric and geological records to propose a nested biosignature model that tests whether a past Venusian biosphere measurably influenced the planet's evolution, suggesting that biological history should be evaluated as a source term within the physical planetary model rather than through isolated molecular signatures.

Bishal Neupane2026-09-21
🔭 astrophysics

Geolocating Ground Observers from Single Photographs of Total Solar Eclipses Using Lunar Limb1 Topography and Contact Geometry

This paper demonstrates that a single photograph of a total solar eclipse, combined with its timestamp, can geolocate the observer to within tens of kilometers by matching observed Baily's beads and the emergence arc against a forward model of lunar limb topography and Moon-Sun contact geometry, achieving a median accuracy of 66 km across thousands of crowdsourced images from the 2017 and 2024 eclipses.

Sadiya Ahmad2026-09-18
🔭 astrophysics

Study of Anisotropy in a Dark Energy Model with Latest Observations

This study extends the sign-switching dark energy model (ΛsCDM) to include anisotropic expansion, finding that while the anisotropy parameter is tightly constrained to be negligible, the framework effectively alleviates the Hubble tension to the 3.7σ level and is strongly favored over standard ΛCDM by recent cosmological observations.

Manish Yadav, Archana Dixit, Pardeep Pardeep, Anirudh Pradhan, M. S. Barak2026-09-17
🔭 astrophysics

Source-Region Properties and Sun–Earth Transit Kinematics of Geoeffective Coronal Mass Ejections Across Solar Cycles 23–25

This study statistically analyzes 177 geoeffective coronal mass ejections across solar cycles 23–25 to characterize their source-region properties and Sun–Earth transit kinematics, revealing that storm intensity is primarily driven by interplanetary magnetic field strength and duration rather than flare magnitude, while also identifying a westward source bias and a hyperbolic relationship between CME speed and transit time.

Saurabh Tripathi, Tanmoy Samanta, Jayant Joshi, Vaibhav Pant2026-09-15
🔭 astrophysics

SDM: A Two-Stage Coarse-to-Fine Pipeline for Predicting Full-Catalog Satellite Streak Photometry, Astrometry, and Detector-Count Contamination in Zwicky Transient Facility

This paper introduces the Satellite Detection Model (SDM), an open-source, two-stage coarse-to-fine pipeline that predicts full-catalog satellite streak photometry, astrometry, and detector contamination for Zwicky Transient Facility exposures by combining SGP4 orbital propagation with detailed geometric and flux simulations to generate pixel-level synthetic contamination maps.

Yana Choudhary2026-09-15