Results 21 to 30 of about 399 (137)
Ionization-bounded and density-bounded planetary nebulae
, 2009 Planetary nebulae (and in general any photoionized region) can be classified as ionization-bounded or density-bounded. It is important to determine in which case is the planetary nebula studied to be able to estimate from nebular observations, for ...
Rodriguez, Luis F. +3 more
core +1 more source
The Case for a Completely Solid Martian Mantle—No Basal Magma Layer Extant
Journal of Geophysical Research: Planets, Volume 131, Issue 6, June 2026.Abstract Recent results from the Mars InSight mission suggested the existence of a molten silicate layer atop the core‐mantle boundary. Geophysical modeling of this layer suggested that it must be denser than the overlying mantle but less dense than the core, and have either a viscosity similar to that of the overlying solid mantle or a strong chemical
Megan S. Duncan +2 more
wiley +1 more source
Geostandards and Geoanalytical Research, Volume 50, Issue 2, Page 341-367, June 2026.Key Points We recommend using the notation δ122/118SnNIST SRM 3161a for mass‐dependent Sn isotope data. We derived conversion factors relative to NIST SRM 3161a for Puri Sn CEZA (0.132 ± 0.011‰), Sn Lyon (0.229 ± 0.016‰), Sn IPGP (0.162 ± 0.018‰). Tin isotope compositions are presented for SPEX CertiPrep Sn and nine USGS reference materials.
Aurélia C.E. Meister +10 more
wiley +1 more source
New groups of planetary nebulae with peculiar dust chemistry towards the Galactic bulge
, 2010 Aims. We investigate Galactic bulge planetary nebulae without emission-line central stars for which peculiar infrared spectra have been obtained with the Spitzer Space Telescope, including the simultaneous signs of oxygen and carbon based dust.
J. V. Perea-Calderón +4 more
core +1 more source
Combustion and Pyrolysis EA‐IRMS Techniques to Determine the δ2H of Diamonds
Rapid Communications in Mass Spectrometry, Volume 40, Issue 10, 30 May 2026.ABSTRACT Rationale Diamonds are generally considered to be metasomatic minerals originating from the Earth's mantle. They formed through the interaction of carbon‐bearing fluids or melts with the surrounding deep lithology. Most knowledge about the formation of diamonds comes from studying their mineral inclusions or stable isotopes.
François Fourel +4 more
wiley +1 more source
Optical polarimetry of bipolar planetary nebulae [PDF]
, 2001 Chapter 1 gives a brief review of the relevant aspects of stellar evolution leading to the formation of a planetary nebula. Included in this review is a discussion of the most important factors which appear to dictate the shaping and general ...
Booth, Paul Anthony
core
Soil Health Within Soil Security
European Journal of Soil Science, Volume 77, Issue 3, May–June 2026.ABSTRACT Soil health and soil security are integral to the long‐term sustainability of soils. While soil health is a widely recognised concept, it is limited by its lack of standardisation and often its anthropocentric approach, neglecting broader ecological functions.
Quentin Styc +15 more
wiley +1 more source
Reconstruction and visualization of planetary nebulae [PDF]
, 2005 journal articleAbstract-From our terrestrially confined viewpoint, the actual three-dimensional shape of distant astronomical objects is, in general, very challenging to determine.
Magnor, Marcus; Kindlmann, Gordon; Durie, Neb +1 more
core
IRAS studies of the nature of interstellar dust and planetary nebulae [PDF]
, 1987 The IRAS data has provided a huge quantity of data, which will be used far into the future. It has its impact on many astronomical research fields from asteroids to cosmology.
Leene, Arnaud
core +3 more sources
Ryugu reference project: Recommendations from the measurement definition team
Meteoritics &Planetary Science, Volume 61, Issue 5, Page 819-848, May 2026.Abstract Sample return missions play a significant role in planetary science by providing pristine extraterrestrial materials. JAXA's Hayabusa2 and NASA's OSIRIS‐REx missions have returned samples from the C‐type asteroids Ryugu and Bennu, respectively. The chemical and mineralogical compositions of these samples closely resemble those of CI chondrites,
Tetsuya Yokoyama +16 more
wiley +1 more source