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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 ↗517 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.
- arXiv · Published · First archived
JWST Reveals the Kuiper Belt-like Compositions of the Uranian Rings and Small Moons ↗
We present the JWST NIRSpec 1--5 micron spectra of the Uranian rings and four ringmoons: Puck, Perdita, Portia, and Juliet. We find that the compositions of the rings and moons strongly resemble water-type Kuiper belt objects, showing deep 3.0 micron O--H and water ice features as well as the CO$_2$ band at 4.27 micron. The volatiles show a radial trend of decreasing volatile abundance at closer radial distance to the planet, consistent with recent estimates of the densities of the innermost moons. Given the observed compositional signatures, we suggest two ways to reconcile the history of the…
- Hacker News · Posted on Hacker News · First archived
Astronomer watches Starlink satellites sinking to build a 'planetary barometer' ↗
Hacker News discussion.
- arXiv · Published · First archived
Negative and Positive Cascade Rates of Slow Alfvénic Turbulence in Switchback and Non-switchback Intervals: \emph{Wind} Observations ↗
We estimate the turbulent cascade rate in imbalanced Alfvénic turbulence in the slow solar wind using a Politano--Pouquet-based approach that does not require an isotropic assumption. We analyze selected 8-hour intervals provided by \emph{Wind} spacecraft. These intervals are characterized by near-homogeneity, weak velocity shear, and imbalanced Alfvénic fluctuations, and are classified as switchback or non-switchback depending on the angular spread of the magnetic field relative to the mean field. Switchback intervals are identified by large magnetic-field rotations, whereas non-switchback in…
- arXiv · Published · First archived
Variable X-ray flux may explain variable helium escape from the habitable-zone exoplanet LHS 1140b ↗
A central goal in exoplanet science is to understand the conditions under which potentially habitable worlds retain atmospheres. This question is of special interest for worlds orbiting M stars, whose habitable-zone planets are more readily observable, but which also emit prolonged high-energy radiation that can erode planetary atmospheres. For one such world, LHS 1140b, a rocky planet orbiting in the habitable zone of an inactive star, time-variable helium absorption has been observed as the planet transited in front of its host star, consistent with atmospheric escape. We present X-ray/ultra…
- arXiv · Published · First archived
Inclination of Miranda as a Constraint on the Tidal Dissipation of Uranus ↗
The five major moons of Uranus record a complicated geological history characterized by both tectonic resurfacing and heavy impact cratering, connecting their evolution to dynamical processes in the Solar System. Miranda, the smallest and closest major moon to Uranus, has an unusually large orbital inclination ($4.3^\circ$) and an remarkable surface geology dominated by coronae and tectonic structures. In this paper we explore whether Miranda's inclination and geological history can be explained through past orbital resonances within the Uranian satellite system. Using direct $N$-body integrat…
- NASA · Source date · First archived
2026-2027 DWU: Middle School Design Challenge ↗
10 min read Preparations for Next Moonwalk Simulations Underway (and Underwater) 2026-2027 DWU: Middle School Design Challenge Overview The 2026-2027 challenge theme is, “Fueling Flight Design Challenge: New Energy Systems.” As more and more aircraft are a part of the US’ National Airspace System (NAS), NASA and partners at the FAA, at universities, and in the aviation industry are searching for ways to increase safety, make flight more affordable, find new fuels for aircraft, and reduce the amount of time passengers and cargo spend in the air. This year’s Dream with Us Challenge focuses on ne…
- NASA · Source date · First archived
2026-2027 DWU: High School Engineering Challenge ↗
9 min read Preparations for Next Moonwalk Simulations Underway (and Underwater) 2026-2027 DWU: High School Engineering Challenge Challenge Materials Engineering Notebook Template Scoring Rubric Overview The 2026-2027 challenge theme is, “Fueling Flight Design Challenge: New Energy Systems.” As more and more aircraft are a part of the US’ National Airspace System (NAS), NASA and partners at the FAA, at universities, and in the aviation industry are searching for ways to increase safety, make flight more affordable, find new fuels for aircraft, and reduce the amount of time passengers and cargo…
- arXiv · Published · First archived
Mind the second gap: The impact of gaps on noise and signal parameter inference ↗
Gravitational-wave data is never analysed without some conditioning: filtering and tapering act multiplicatively on the noise, destroying the stationarity on which the Whittle likelihood --- the backbone of nearly all gravitational-wave inference --- rests. The problem is particularly evident for LISA, where gaps are expected to overlap almost all signals and the noise must be estimated jointly with those astrophysical signals. We provide an analytical and numerical framework to assess the impact of noise mis-modelling when signal and noise parameters are inferred jointly in the presence of ga…
- arXiv · Published · First archived
Cosmic Heterogeneity Shapes the Evolution of Dark Energy and Time ↗
Early- and late-Universe measurements of the Hubble constant disagree, a puzzle known as the Hubble tension. We derive cosmological parameters from first principles, using only the dynamics of cosmic volume and the possibility that matter can be unevenly distributed. Within this framework, three of the six parameters of the standard model are obtained from the underlying dynamics rather than fitted to observations: volume formation determines the dark-energy density parameter to be two thirds, spatial curvature vanishes, and the matter density follows from the remaining cosmic energy budget. T…
- Hacker News · Posted on Hacker News · First archived
Meteor M2-4: Receiving Weather Satellite Images from My Garden in San Francisco ↗
Hacker News discussion.
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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