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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 ↗523 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
Katalyst Concludes Link Mission, Advances Future Robotic Space Operations ↗
Hacker News discussion.
- arXiv · Published · First archived
Stellar parameters and abundances for 3.2 million DESI DR1 spectra using machine learning ↗
We present a machine-learning pipeline for determining stellar parameters and chemical abundances from spectra observed by the Dark Energy Spectroscopic Instrument (DESI). Building on the model-driven Payne framework, we train an artificial neural network on ~370,000 synthetic spectra spanning FGK stars, and fit the network directly to the flux-calibrated, un-normalised spectral energy distribution (SED) of each star, rather than to a continuum-normalised spectrum as done by DESI's official Stellar Parameter (SP) pipeline. Internal accuracy tests show a median interpolation error of less than…
- arXiv · Published · First archived
Beyond dust in local cosmography: covariant kinetic theory ↗
Modelling cold dark matter as dust makes the matter congruence geodesic and therefore removes any intrinsic dipole from the local Hubble flow. The dust model breaks down as stream crossing develops, whereas a collisionless gas accommodates stream crossing via velocity dispersion in phase space. We develop a covariant kinetic framework for this regime without assuming a background spacetime or any geometrical symmetry. Starting from the exact massive Vlasov hierarchy, we construct its energy-integrated moments and organise these by velocity weight. A self-consistent truncation at the quadrupole…
- NASA · Source date · First archived
APOD: 2026 October 3 – Selfie at Vera Rubin Ridge ↗
APOD Science APOD APOD: 2026 October 3 –… Today’s APOD Archive Submissions Index Search Calendar RSS Education About Discuss APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Selfie at Vera Rubin Ridge Explanation: On sol 1943 of its journey of exploration across the surface of Mars, the Curiosity Rover recorded this selfie at the south rim of Vera Rubin Ridge. Of course a sol is a Martian solar day , about 40 minutes longer than an Earth d…
- OpenAlex · Published · First archived
Composite learning adaptive control in Cartesian space for redundant manipulators via least-squares modulation ↗
Abstract This paper presents a Cartesian-space composite learning adaptive controller whose least-squares modulation-based update law tracks the prescribed tasks and identifies the uncertain dynamic parameters of redundant robot manipulators. Unlike joint-space control strategies, the developed method does not require inverse kinematic solutions, an advantage for redundant manipulators with multiple inverse kinematic solutions. The controller ensures exponential convergence of the end-effector tracking error, subtask objectives, and parameter estimation error on a prescribed singularity-free o…
- OpenAlex · Published · First archived
Tall buildings with diagrids: design exploration and assessment of the influence of the architectural form on the structural behavior ↗
Tall buildings with diagrids offer several advantages over alternative structural solutions, including the possibility of reducing the dimensions of interior cores and freeing up interior space. However, the interplay between structural systems and architectural form is not always adequately considered during the early stages of design to support quantitative decision-making. In this study, a database comprising 1000 tall buildings has been generated using parametric modeling. The buildings range in height from 140 to 300 meters. These buildings have then been subjected to seven ground motions…
- OpenAlex · Published · First archived
Dual‐Timescale–Based Cache and Bandwidth Control Scheme in Integrated Satellite‐Terrestrial Networks ↗
ABSTRACT Recently, the integrated satellite‐terrestrial network (ISTN) system offers a promising solution for extending wireless communication services to remote and underserved areas. To effectively provide a variety of services, it is essential to cache the corresponding services on satellites while dynamically allocating the satellite bandwidth. However, challenges arise due to dynamic ISTN service requests that vary over time and space, as well as limited cache and bandwidth resource capacities on satellites. In this paper, the caching placement and bandwidth allocation algorithms are inve…
- OpenAlex · Published · First archived
PROPORTIONALITY OF MEDIA SPACE AND VIRTUAL COGNITION: A SYNERGETIC ANALYSIS AND EPISTEMOLOGICAL FRAMEWORK ↗
The rapid expansion of digital media has transformed the relation between information environments and human cognition from a predominantly linear communication problem into a dynamic, non-linear, and reflexive problem of knowledge formation. This article examines the proportionality between media space and virtual cognition through a synergetic and epistemological framework. Drawing on the concepts of self-organization, order parameters, fluctuations, bifurcation, and nonequilibrium dynamics, it conceptualizes the human cognitive system as an open system coupled to an algorithmically structur…
- OpenAlex · Published · First archived
Multiscale feature fusion based CNN with feature ranking for satellite image classification ↗
Satellite image classification plays an important role in various applications like monitoring, surveillance, land cover planning, etc. Deep learning models with many learnable parameters face overfitting as model depth increases and have struggled to extract both fine details and broader patterns simultaneously. To overcome the aforementioned issues, an efficient CNN model of <0.23 million parameters is proposed, utilising the extraction of multiscale features across different CNN branches. After concatenating the two branches, a global average pooling (GAP) layer is added to mitigate overfit…
- arXiv · Published · First archived
Shared Geometry Is Not Shared Physics: A Layerwise Test of the Platonic Representation Hypothesis in Astronomy ↗
In this paper we investigate whether geometrically aligned astronomical representations are also scientifically interchangeable. We analyze every layer's representation from 36 pretrained models using cross-matched optical images, infrared images, and spectra. All 139 analyzed model-survey comparisons show significant local-neighborhood alignment somewhere in the network after accounting for the search over depth. However, alignment does not generally increase with network depth and can be stronger for the changes between consecutive computational blocks than for the block outputs themselves.…
Live window recorded . This is the ingestion observation time, not the publication or discovery date of each source.
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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