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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 ↗519 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 Space Between Two Fingers ↗
Hacker News discussion.
- arXiv · Published · First archived
Graceful Exit to Radiation Domination in the Starobinsky Model: A Dynamical Realization ↗
The Starobinsky model provides a successful realization of inflation and serves as a benchmark for alternative inflationary models. Motivated by its observational success, we investigate the dynamical evolution of the early Universe within this framework. Incorporating radiation production from scalaron decay, we formulate a coupled system of dynamical equations describing scalaron depletion and radiation buildup while ensuring exact energy conservation in the expanding background. In the Friedmann equation, both scalaron and radiation components gravitate, thereby accounting for the backreact…
- arXiv · Published · First archived
Solarprop 2.0: Modern charge-sign dependent solar modulation for everyone ↗
I present a greatly improved version of SOLARPROP, an open source framework for building models of charge-sign dependent solar modulation of cosmic rays in the heliosphere. The transport equation of charged particles is solved by converting it to a set of stochastic differential equations (SDEs). The code now includes the full set of SDEs in two spatial dimensions, allowing for magnetic fields with latitudinal components, and it has been generalized to accommodate models in three spatial dimensions. Due to code parallelization and optimization, a speedup of up to three orders of magnitude with…
- arXiv · Published · First archived
Planetary eccentricity enhances inward comet transport but suppresses gentle impacts ↗
Comets can supply volatile and prebiotic material to rocky planets, but survival of fragile molecules depends on atmospheric entry and impact. Compact planet chains can transfer comets inward at low velocity. We test whether modest planetary eccentricity preserves this route. We follow 64,000 comets from the region between the two outermost planets of an eight-planet chain to an Earth-mass planet on a temperate orbit around a $0.1 M_\odot$ star. A second suite of simulations isolates the last transfer to the innermost planet across initial planet eccentricities $e_{p,0}=0$--$0.05$ and separati…
- arXiv · Published · First archived
Comparing Optimized Systematic Error Correction Methods on Selected TESS Light Curves ↗
The correction of systematic errors in TESS light curves is crucial for all astrophysical analyses employing these observations. Here we present a data analysis and a software package, SysCoCoPy, to investigate and directly compare the performance of the Presearch Data Conditioning (PDC) correcting method from the Science Processing Operations Center (SPOC) pipeline and three correctors developed by the community. We incorporate these three correctors based on their implementations in Lightkurve and are particularly interested in the ability of the four correctors to remove scattered light con…
- NASA · Source date · First archived
APOD: 2026 October 1 – Harvest Moon with Erupting Mount Etna ↗
APOD Science APOD APOD: 2026 October 1 –… 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. Harvest Moon with Erupting Mount Etna Explanation: Have you ever seen the full moon rise? This colorful image was photographed last weekend in Sicily , just outside the town of Nicosia, in Italy . It is a composite photograph that shows the Moon rising as the sky turns…
- NASA · Source date · First archived
An Agricultural “Island” in the Saskatchewan River Delta ↗
Earth Observatory Science Earth Observatory An Agricultural “Island”… Earth Earth Observatory Image of the Day EO Explorer Topics All Topics Atmosphere Land Heat & Radiation Life on Earth Human Dimensions Natural Events Oceans Remote Sensing Technology Snow & Ice Water More Content Collections Global Maps World of Change Articles Earth Matters Blog Blue Marble: Next Generation EO Kids Mission: Biomes About About Us Subscribe 🛜 RSS Contact Us Search Summer autumn NASA Earth Observatory/Michala Garrison NASA Earth Observatory/Michala Garrison Summer autumn NASA Earth Observatory/Michala Garriso…
- OpenAlex · Published · First archived
Astronomical Self-Calibration of Fisheye Cameras for Photovoltaic Sun-Tracking Applications ↗
Vision-based photovoltaic (PV) tracking requires a calibrated mapping from fisheye pixels to physical solar directions, yet deployed cameras may lack calibration targets or a surveyed pose. This study asks whether timestamped sky images can recover a camera mapping that is internally consistent with a solar ephemeris, while explicitly accounting for localisation coverage and parameter uncertainty. A staged pipeline combines photometric solar-candidate detection, ephemeris-guided re-localisation, temporal and model-consistency gates, three monotonic fisheye projections, and six calibration solv…
- OpenAlex · Published · First archived
An Improved Space Vector Modulation Strategy with Optimized Switching Sequences for Reduced Current THD ↗
This paper presents optimized Space Vector Modulation (SVM) switching sequences for three-phase Voltage Source Inverter (VSI)-fed induction motor (IM) drives, focusing on harmonic suppression and switching loss reduction. With the growing demand for high-performance motor drives in industrial applications, advanced Pulse Width Modulation (PWM) techniques play a crucial role in minimizing current distortion, enhancing DC bus utilization, and improving inverter efficiency. The study evaluates conventional SVM, its switching sequences, bus clamping techniques, and enhanced bus clamping strategies…
- OpenAlex · Published · First archived
‘The auditors of their discourses, the readers of their treatises, were men’: questions of gender and audience in Agnes Clerke’s astronomy publications ↗
Abstract In the nineteenth century, British and Irish women interested in astronomical work faced limited options, generally restricted to the roles of human computers in observatories or assistants on eclipse expeditions. Agnes Clerke (1842–1907) nonetheless navigated a successful career as a writer of popular-astronomy books, including her most famous work, A Popular History of Astronomy during the Nineteenth Century (1885). Women are notably absent in Clerke’s Popular History , a marked contrast to a 1901 article titled ‘Women in science’ that she published in the Victorian women’s periodic…
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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