![Semimajor axis distribution of captured ISOs in three simulations, each with stellar mass M⋆ = 0.7 M⊙ and impact parameter b = 3000 au, but with velocity at infinity v∞ = 1, 3, and 10 km/s. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/interstellar.png?resize=1200%2C717&ssl=1)
[astro-ph.EP] As they orbit within the Galaxy, stars swim through a vast population of interstellar objects (ISOs).
Interstellar
![Orbital trajectories of two example scattering experiments. Left: An interaction that results in a free-floating planet-moon pair. Right: An interaction that results in a free-floating planet and a separate free-floating moon. The starting points of the bodies are indicated by the black dots. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Planet-moon.png?resize=1200%2C720&ssl=1)
Posted inStellar Cartography
Planet-moon Ejections In Close Stellar Encounters
[astro-ph.EP] Free-floating planet-moon pairs (FFPMs) may form when planetary systems experience close stellar encounters.
![Gas-phase abundance evolution of CH3OH, CH3CHO, CH3OCHO, and CH3OCH3 in the representative warm-up model with Tmax = 200 K. The shaded rectangles indicate the observed abundance ranges derived in this work. The gray vertical band marks the time interval, (1.25–1.42) × 106 yr, over which the model abundances overlap most closely with the observed ranges for the four species. -- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Molecule-dependent.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry
Molecule-dependent Abundance Behavior of Oxygen-bearing Complex Organics in High-Mass Star-Forming Regions: A Uniform 50-source Survey
[astro-ph.GA] We present a uniform IRAM-30m survey analysis of four oxygen-bearing complex organic molecules (COMs), methanol (CH3OH), acetaldehyde (CH3CHO), methyl formate (CH3OCHO), and dimethyl ether (CH3OCH3), toward 50 high-mass star-forming […]
Posted inAstrochemistry
ALMA Central Molecular Zone Exploration Survey (ACES) I: Overview
[astro-ph.GA] The mass flows and energy cycles within the inner regions of galaxies exert a powerful influence on the evolution of the galaxy population.
Posted inExoplanets, -moons, -comets
Growing Planets Produce Extreme Dust Signatures
[astro-ph.EP] Collisions between planetary bodies are essential to the assembly of rocky planets like the Earth, but they are extremely difficult to observe. We therefore rely on indirect signatures of […]
Posted inAstrochemistry
Efficient Interstellar Grain Growth From High Sticking Coefficients On Amorphous Carbon Dust
[astro-ph.GA] Cosmic dust is the solid phase of the interstellar medium (ISM), classically assumed to be composed of carbonaceous and silicate grains with size distributions spanning ∼5 Å to ∼1 […]
![Temporal dynamics of simulated civilizations across ten scenarios. (A) Mean trajectories of global technology T(t) with ±1 standard deviation shaded. (B) Mean resource levels R(t) with ±1 standard deviation shaded. -- [physics.soc-ph]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Projections-of-Earth.png?resize=1200%2C720&ssl=1)
Posted inSETI & Technosignatures
Projections of Earth’s Technosphere: Civilization Collapse-Recovery Dynamics and Detectability
[physics.soc-ph] How long a technological civilization remains active, and what determines whether it collapses or persists, is a central question for both projecting humanity’s future and assessing the prevalence of […]
Posted inAstrochemistry
Experimental Astrochemistry And Machine Learning Unravel The Formation Of Oxygen-bearing Organic Molecules In Extraterrestrial Ices
[Nature Communications Chemistry] Oxygen-bearing organic molecules, including aldehydes, alcohols, and peroxides, serve as key precursors to complex organics in extraterrestrial environments. Their non-equilibrium formation mechanisms critically constrain the molecular complexity […]
![Time evolution of the probability distribution of the system for different temperatures as labeled and for fixed parameters: V=106 km3 , L=10 53 erg/s, r=0.01 AU, Grac=26.30 kJ/mol. The vertical axis is enantiomeric excess, and the horizontal axis is time in Myr scale. -- [astro-ph.HE]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Supernova-Neutrinos.png?resize=1200%2C715&ssl=1)
Posted inAstrochemistry
Supernova Neutrinos And The Origin of Biomolecular Homochirality
[astro-ph.HE] We investigate the role of parity-violating interactions between supernova neutrinos and chiral molecules in nearby interstellar molecular clouds as a potential source of biomolecular homochirality.
![[Top] Spin density plot of H2S on a charged surface. The red lobe visualizes where the extra electron resides within the complex. In both (a) and (b), the extra electron is located in a pocket created by the coordination of nearby H-atoms from both the ASW surface and the H2S molecule. [BOTTOM] SO2 on a (a) neutral surface and on a (b) charged surface. Panel (a) shows both the S - - O interaction and the dH - - O interaction often found in these neutral ASW/SO2 complexes. The wireframe in panel (b) shows the spin density of the charged ASW/SO2 complex. The extra electron clearly resides in the LUMO of SO2 and interacts with the surface through multiple dH - - O interactions. -- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Effect-of-Ice.png?resize=1200%2C766&ssl=1)
Posted inAstrochemistry
Effect Of Ice Charging On The Astrochemistry Of Interstellar Sulfur Bearing Species On Amorphous Solid Water
[astro-ph.GA] We aim to derive statistically robust and physically interpretable BE distributions for atomic S and the sulfur-bearing molecules H2S, SO2, and OCS on neutral and negatively charged ASW, and […]