Results 51 to 60 of about 207,371 (176)
Fossils as cultural heritage: Scientific, commercial and legislative issues
Geology Today, Volume 42, Issue 5, Page 263-272, September/October 2026.Fossils are among the principal sources for understanding the history of life through ‘Deep Time’ and can inform projections of biotic responses to environmental change. Despite a widespread recognition of the scientific, historical and communication significance of fossils in our culture, their role as part of our cultural heritage is still far from ...
Federico Fanti +5 more
wiley +1 more source
Meteoritics &Planetary Science, Volume 61, Issue 9, Page 2201-2217, September 2026.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
Neutron-Capture Element Abundances in Planetary Nebulae
Galaxies, 2020 Nebular spectroscopy is a valuable tool for assessing the production of heavy elements by slow neutron(n)-capture nucleosynthesis (the s-process). Several transitions of n-capture elements have been identified in planetary nebulae (PNe) in the last few ...
N. C. Sterling
doaj +1 more source
Catalog of Planetary Nebulae Detected by GALEX and Corollary Optical Surveys
The Astrophysical Journal Supplement Series, 2023 Planetary nebulae (PNs) consist of an ionized envelope surrounding a hot central star (CSPN) that emits mostly at ultraviolet (UV) wavelengths. UV observations, therefore, provide important information on both the CSPN and the nebula. We have matched the
M. A. Gómez-Muñoz +2 more
doaj +1 more source
Meteoritics &Planetary Science, Volume 61, Issue 9, Page 2303-2335, September 2026.Abstract Carbonaceous chondrites contain phosphorus, whose speciation and thus history remain to be investigated. Phosphorus/sulfur‐bearing assemblages have been reported in carbonaceous CM chondrites, but there is no consensus about their exact compositions and origins.
Valentine Megevand +4 more
wiley +1 more source
, 2010 Recent infrared spectroscopic observations have shown that proto-planetary nebulae (PPNs) are sites of active synthesis of organic compounds in the late stages of stellar evolution. This paper presents a study of Spitzer/Infrared Spectrograph spectra for
Hrivnak, BJ +8 more
core +1 more source
Meteoritics &Planetary Science, Volume 61, Issue 9, Page 2269-2283, September 2026.Abstract We report the discovery of the second (Al,Cu)‐alloy–bearing micrometeorite, FB‐A2, recovered from Mount Gariglione (southern Italy), representing the sixth such occurrence worldwide. Although chondritic in nature, FB‐A2 differs markedly from previously described microspherules.
Giovanna Agrosì +6 more
wiley +1 more source
Planetary nebulae beyond the milky way - Historical overview [PDF]
, 2006 Up to 10% of the total luminosity of a planetary nebula, ~500 L⊙, can be emitted in the dominant cooling line, [O iii] λ5007. This, coupled with the narrowness of the line (~15-25 km s-1), makes it extremely easy to detect PNe in external galaxies using ...
Barlow, MJ
core +1 more source
Aggregation and the Structure of Value
Noûs, Volume 60, Issue 3, Page 619-644, September 2026.ABSTRACT Roughly, the view I call “Additivism” sums up value across time and people. Given some standard assumptions, I show that Additivism follows from two principles. The first says that how lives align in time cannot, in itself, matter. The second says, roughly, that a world cannot be better unless it is better within some period or another.
Weng Kin San
wiley +1 more source
Proposed nomenclature for extragalactic planetary nebulae
, 2006 The ability to identify and distinguish between the wide variety of celestial objects benefits from application of a systematic and logical nomenclature.
Acker, A, Parker, QA
core +1 more source