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Earlier sources: Space
Space research and engineering study the universe and build the systems used to reach and observe it. Follow astronomy, spacecraft, launch systems, satellites, exploration, and Earth observation.
SYMTRI organizes observations from public sources into a living map. Connections reflect shared subject matter; they do not establish causation or endorse a source.
Open in the map ↗531 classified signals in the fourteen-day window. Recent momentum: steady. These counts include signals awaiting readable evidence.
Earlier sources
Up to ten sources with readable evidence, ordered by their feed timestamp. These archive sources can be older than the live fourteen-day window. This list is a sample, not a measure of total activity. Dates distinguish paper publication, repository creation, model/dataset activity, Hacker News posts, and KEV catalog additions. “First archived” records when SYMTRI first stored the signal.
- Hacker News · Posted on Hacker News · First archived
The moon matters NASA chief: China may deny access to Moon's South Pole ↗
Hacker News discussion.
- Hacker News · Posted on Hacker News · First archived
Google plans first test ofAl chips in space under Project Suncatcher ↗
Hacker News discussion.
- arXiv · Published · First archived
On the Compositions of Interstellar Objects ↗
As physical samples of distant planetary systems, the compositions of interstellar objects (ISOs) should correlate with the properties of their diverse parent stars. We combine a chemical partition model with a sample of stellar elemental abundances from APOGEE DR17 to predict the abundances of commonly-observed cometary volatiles in ISOs. We find that the compositions of ISOs vary significantly between different stars. In particular, we predict a strong correlation between an ISO's ammonia abundance and its parent star's metallicity: high-metallicity stars will create ISOs rich in ammonia. Th…
- arXiv · Published · First archived
Pulsed Accretion onto Eccentric Binaries in Highly Misaligned Circumbinary Disks ↗
We present three-dimensional smoothed particle hydrodynamics simulations of highly misaligned circumbinary disks (CBDs) around moderately eccentric equal-mass binaries ($e_\mathrm{b}=0.5$). We show that the binary accretion is modulated on the binary orbital period and exhibits two pulses near periastron. The dominant pulse peaks before periastron for an initial binary-disk misalignment of $60^\circ$, shifts to after periastron at $90^\circ$, and occurs at an even later post-periastron phase at $120^\circ$. We further show that the two pulses are accompanied by a time-dependent response of the…
- OpenAlex · Published · First archived
Subdifferentials of Convex Operators Valued in the Space of Integrable Functions with Applications to Risk-Averse Optimization ↗
We study differentiability properties of convex operators defined on a Banach space with values in an L_(p) space and of their compositions with monotonic convex functionals on this space. We develop new tools for operators enjoying an additional feature known as the local property. The new approach and results go beyond the classical theory of normal integrands and lattice-valued operators. We further describe the subdifferentials of compositions of such operators with convex monotonic functionals. The new results are applied to obtain novel optimality conditions in the subdifferential form f…
- OpenAlex · Published · First archived
Unified Multi-Application Segmentation of High-Resolution Satellite Images Through Consensus-Based Probabilistic Fusion ↗
Deep-learning-based land cover segmentation models for high-resolution aerial images often suffer from inconsistent performance on unseen data due to limited spatial and temporal dataset ranges alongside inherent labeling inconsistencies. Existing solutions, such as foundation models and unsupervised domain adaptation, offer indirect improvements but require considerable post-processing or transfer learning. To address this limitation, this study introduces a direct dataset integration method that fuses heterogeneous datasets with disparate class compositions into a single operational framewor…
- OpenAlex · Published · First archived
Orbit Determination of Cislunar Spacecraft Using Inter-Satellite Link Measurements with an Earth-Orbiting Satellite Constellation ↗
With the increasing number of lunar missions, utilizing satellites in special orbits in the cislunar space as relay satellites to provide communication relay and navigation services for spacecraft near the Moon has become a hot topic. DRO (Distant Retrograde Orbit) and NRHO (Near-Rectilinear Halo Orbit) are widely used in lunar and deep space exploration missions, offering unique orbital advantages. With the development of a global constellation of LEO satellites, this paper utilizes intersatellite link measurements between LEO satellites and cislunar probes to determine orbital parameters. Un…
- OpenAlex · Published · First archived
Deciphering the allosteric landscape of 5-HT2 receptors: integrated molecular dynamics and fragment molecular orbital analyses of activation mechanisms ↗
Abstract Background The 5-HT 2 receptor subfamily (5-HT 2A , 5-HT 2B , and 5-HT 2C ) is a cornerstone of neuropsychiatric drug design, yet the precise molecular determinants of their activation and biased signaling remain only partially elucidated. This study aimed to investigate the conformational transitions and energetic landscapes across diverse functional states to provide a refined structural blueprint of the allosteric signaling mechanisms. Methods We integrated Molecular Dynamics (MD) simulations, Dynamical Network Analysis (DNA), and Fragment Molecular Orbital calculations combined wi…
- OpenAlex · Published · First archived
Digital connectivity in the desert: A digital geography of social media adoption, mobility, and pastoral space among transhumant communities in southern Morocco ↗
Mobile pastoralists in the arid south of Morocco have rapidly adopted WhatsApp and Facebook, though network coverage across their rangelands is fragmented, and absent in the remotest zones. How does this reshape the space of pastoral life? Rural studies has examined digital connectivity mainly among settled populations awaiting infrastructure; this study takes the opposite case — a rural population itself in motion — to ask what that means for connectivity. Drawing on a six-month inventory of the groups these communities use, direct observation of fifteen of them (all ten Facebook groups and f…
- OpenAlex · Published · First archived
Orbital stability of vector multi-solitons in coupled NLS and modified KdV equations ↗
We prove that the N -solitons, including breathers and multi-hump solitons, of the coupled nonlinear Schrödinger (CNLS) equations are orbitally stable in the Sobolev space H N ( R ; C 2 ) . Moreover, ( N 1 , N 2 ) -solitons of the coupled modified Korteweg–de Vries (CmKdV) equations are shown to be orbitally stable in the Sobolev space H 2 N 1 + N 2 ( R ; R 2 ) . The number of negative eigenvalues of the second variation of the Lyapunov functional is N for N -solitons of the CNLS equations, and N 1 + ⌊ ( N 2 + 1 ) / 2 ⌋ for ( N 1 , N 2 ) -solitons of the CmKdV equations, which is obtained by e…
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How to assess evidence about Space
Check each original source for its methods, release status, limitations, and supporting data. A repository announcement, a preprint, and a published study provide different kinds of evidence. SYMTRI’s subject classification helps discovery; it does not independently validate the source’s claims.
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