Results 101 to 110 of about 2,536 (230)
Galactic removal rates for long-period comets
The Astronomical Journal, 1990 The accuracy of first-order perturbation theory for long-period comets in a galactic tidal field is examined by comparing the theoretical predictions for changes in perihelion distance to the results of direct numerical integrations. It is found that the first-order theory agrees well with the integrations. 11 refs.
openaire +1 more source
The Origins of Ploem's Filter Cube: A Pandora's Box
Journal of Microscopy, EarlyView.Abstract Ploem's filter cube, central to modern epifluorescence microscopy, integrates three matched optical components: an excitation filter, an emission filter, and a dichroic mirror. Together, these elements enable the separation of excitation and emission light paths, producing high‐contrast fluorescence images.
Jack Gordon +3 more
wiley +1 more source
Testing MOND on Small Bodies in the Remote Solar System
The Astrophysical JournalModified Newtonian dynamics (MOND), which postulates a breakdown of Newton's laws of gravity/dynamics below some critical acceleration threshold, can explain many otherwise puzzling observational phenomena on galactic scales.
David Vokrouhlický +2 more
doaj +1 more source
A description of dental microanatomy and implantation geometry in Chamaeleonidae
Journal of Anatomy, EarlyView.A reassessment of the dental histology in adult chamaeleons reveals the presence of periodontal ligament. Alongside alveolar bone and cementum, these tissues together constitute a compacted and remodelled tripartite periodontium. Our findings include the novel observation of plicidentine‐like protuberances of dentine within underlying bone.
Giles D. Sukkert +4 more
wiley +1 more source
The Astronomical JournalHyperactive comet activity typically becomes evident beyond the frost line (∼3–4 au) where it becomes too cold for water-ice to sublimate. If carbon monoxide (CO) and carbon dioxide (CO _2 ) are the species that drive activity at sufficiently large ...
Dave G. Milewski +5 more
doaj +1 more source
Local Elites in Chile's Pisco Valley: Dispossession, Legal Mobilisation and Intertwined Citizenship
Journal of Agrarian Change, EarlyView.ABSTRACT In countries in the Global South, citizenship is often closely tied to access to water and land ownership. In Latin America, the literature has primarily explored social mobilisation and identity reconfiguration in response to development‐driven processes of land and water dispossession affecting peasants, rural and Indigenous communities ...
Chloé Nicolas‐Artero
wiley +1 more source
The Astronomical JournalComets, relics from the early solar system, consist of dust and ice. The ice sublimates as comets approach the Sun, ejecting dust from their nuclei seen as activity.
Yuna G. Kwon +6 more
doaj +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract Here we report on the microstructure and chemistry of sulfide minerals returned from asteroid (162173) Ryugu. We identify a unique sulfide population in particle A0016 composed of violarite (FeNi2S4), pyrite (FeS2), chalcopyrite (CuFeS2), pyrrhotite (Fe1‐xS), and pentlandite ([Fe,Ni]9S8).
M. C. Benner +3 more
wiley +1 more source
The Astrophysical JournalComet C/2023 P1 (Nishimura) was observed by the Solar Orbiter Heliospheric Imager (SoloHI), on board the Solar Orbiter spacecraft, from 2023 September 1 to 14.
Shaheda Begum Shaik +5 more
doaj +1 more source
Development of an Isoline Modeling Method for Extended Small Celestial Objects
Учёные записки Казанского университета: Серия Физико-математические наукиThis article presents a method for modeling extended small celestial (ESC) objects, which are mainly cometary systems. Special attention was given to the possibility of analyzing their structure and physical properties in line with the modern theories of
A. O. Andreev +2 more
doaj +1 more source