![Where the Dyson sphere on and off fits of M77 differ most, and how new photometry changes the comparison. In each panel, the upper sub-panel shows the median posterior AGENT-on (solid red) and AGENT-off (dashed blue) model spectra with shaded 16–84% posterior bands and the fitted photometry overplotted (open black circles), while the lower sub-panel shows the percent deviation of the AGENT-on model relative to the AGENT-off model, with the shaded band giving the 1σ uncertainty propagated in quadrature from the two independent fits. -- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/The-G.png?resize=1200%2C713&ssl=1)
[astro-ph.GA] We present the most robust stellar population synthesis (SPS)-based search for galaxy-spanning technological waste heat to date, applied to 129 nearby galaxies spanning a wide range of spectral energy […]
cosmology
![Helicity asymmetries of the primordial (left panel) and late-time (right panel) density fields for parity asymmetric (blue curves) and symmetric (red curves) simulations. The shaded regions indicate the standard deviation (1σ) of the ensemble-average. The red markers highlight the asymmetries exceeding a statistical significance of 3σ. - [astro-ph.CO]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Probing.png?resize=1200%2C718&ssl=1)
Posted inAstrochemistry
Probing Primordial Chirality in the Matter Distribution
[astro-ph.CO] Whether parity symmetry was violated in the early universe remains one of the fundamental open questions in cosmology. If so, it may leave an intrinsic handedness in the large-scale […]
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Interstellar, Press Release, Stellar Cartography
An Archival Summary: 15 Years Of ALMA Observations On Disks And Planet Formation
The Atacama Large (sub-)millimeter Array (ALMA) has been in scientific operations for almost 15 years.
Posted inAstrobiology (general), Astronomy & Telescopes, Biophysics, Press Release, Stellar Cartography
Naturally Occurring Network Structures At Vastly Different Scales
Editor’s note: Astrobiology has links to and from everything NASA does. I wish NASA would think outside the box when highlighting this topic – and use the word for this […]
Posted inAstronomy & Telescopes, Imaging & Spectroscopy, Interstellar, Status Report, Stellar Cartography
A Revised Three-dimensional Stellar Cartography: Visualization Of The Local Group of Galaxies
A new three-dimensional reconstruction of the Local Group (142 confirmed members) and nearest galaxies (6 members) is presented, addressing the lack of up-to-date visual representations that reflect the rapid pace […]
![[LEFT] Best value of the minimum probability for each cosmology scenario-habitability condition pair mentioned in the text. For each element in this chart, the minimum probability of the best combination of habitability conditions of all those which include the one mentioned is displayed. The top row includes combinations of up to 8 habitability conditions; the rest are capped at 5.[RIGHT] Same - but comparing against origin of life scenarios. -- astro-ph.CO](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/09/Multiverse-Predictions-for-Habitability-Fundamental.png?resize=1200%2C722&ssl=1)
Posted inAstrochemistry, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Habitable Zones, Status Report
Multiverse Predictions for Habitability: Fundamental Physics and Galactic Habitability
In the multiverse hypothesis, a range of universes exist with differing values of our physical constants.
Posted inAstronomy & Telescopes, Interstellar, Press Release, Stellar Cartography
Is Earth Inside A Huge Void?
Earth and our entire Milky Way galaxy may sit inside a mysterious giant hole which makes the cosmos expand faster here than in neighbouring regions of the universe, astronomers say.
Posted inAstronomy & Telescopes, Imaging & Spectroscopy, Interstellar, Press Release
The Galactic Journey Of Our Solar System
An international research team led by the University of Vienna has discovered that the Solar System traversed the Orion star-forming complex, a component of the Radcliffe Wave galactic structure, approximately […]
Posted inGaia - Planetary Perspectives, Habitable Zones, Intelligence & Language, Origin & Evolution of Life, Panspermia, SETI & Technosignatures, Status Report
Percolation Of ‘Civilisation’ In A Homogeneous Isotropic Universe
In this work, we consider the spread of a ‘civilisation’ in an idealised homogeneous isotropic universe where all the planets of interest are habitable.
![CASBI pipeline. In our analysis the Template Library is fixed to the NIHAO simulations. The choice of the Template Library incorporates all the assumptions that we make on the chemical enrichment histories of Galaxies, the dynamical effects that accreted objects undergo, and the cosmology, making this part the principal cause of possible misspecification. We sample non-repeated subhalos aiming to reproduce a Luminosity function N(< L), [17] with fixed total stellar mass budget of the halo [11]. The SBI pipeline can incorporate a Surrogate Simulator to perform the sequential version of NPE. The Observational Realism encapsulates all effects bridging the gap between simulation and observation (e.g. observational uncertainties, selection functions, realistic in-situ stars background, etc.). -- astro-ph.GA](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/11/CASBI-Chemical-Abundance-Simulation.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Imaging & Spectroscopy, Status Report
CASBI – Chemical Abundance Simulation-Based Inference for Galactic Archeology
Galaxies evolve hierarchically through merging with lower-mass systems and the remnants of destroyed galaxies are a key indicator of the past assembly history of our Galaxy. However, accurately measuring the […]