Results 61 to 70 of about 211,186 (262)
Near-Earth Supernova Explosions: Evidence, Implications, and Opportunities [PDF]
, 2019 There is now solid experimental evidence of at least one supernova explosion within 100 pc of Earth within the last few million years, from measurements of the short-lived isotope ⁶⁰Fe in widespread deep-ocean samples, as well as in the lunar regolith ...
Fields, Brian D., Mewaldt, Richard A.
core
Improved flux limits for neutrinos with energies above 10$^{22}$ eV from observations with the Westerbork Synthesis Radio Telescope [PDF]
, 2009 Particle cascades initiated by ultra-high energy (UHE) neutrinos in the lunar regolith will emit an electromagnetic pulse with a time duration of the order of nano seconds through a process known as the Askaryan effect.
A. G. de Bruyn +14 more
core +3 more sources
X‐ray computed tomography study of terrestrial analog cores in preparation for Mars sample return
Meteoritics &Planetary Science, EarlyView.Abstract Mars Sample Return (MSR) is expected to transform planetary science by providing unprecedented access to pristine Martian material. Initial characterization in the sample receiving facility (SRF) will rely on nondestructive techniques such as X‐ray computed tomography (XCT) to document the condition, distribution, and internal features of ...
Sophie Benaroya +3 more
wiley +1 more source
EPJ Web of Conferences, 2017 The proposal to use ground based radio telescopes for detection of Askaryan radio pulses from particle cascades arising when extremely high-energy (EHE > 1020 eV) cosmic rays (including neutrinos) interact with the lunar regolith of multi gigaton mass ...
Zheleznykh Igor +3 more
doaj +2 more sources
Meteoritics &Planetary Science, EarlyView.Abstract Angrite meteorites are critically silica‐undersaturated igneous rocks with high Ca/Al and Fe/Mg, along with depletion in volatile lithophile elements Na and K such that they crystallize anorthite along with olivine and calcic pyroxene. The anorthite in angrites contains substantial Fe, and in NWA 1670 and NWA 1296, it is present at major ...
Seann J. McKibbin +2 more
wiley +1 more source
Evidence for electron Landau damping in space plasma turbulence
Nature Communications, 2019 Various physical mechanisms are proposed to explain the heating observed in turbulent astrophysical plasmas. Here, Chen et al. find a signature consistent with one of these mechanisms, electron Landau damping, by applying a field-particle correlation ...
C. H. K. Chen, K. G. Klein, G. G. Howes
doaj +1 more source
The Second Lunar Anomaly in Ancient Indian Astronomy [PDF]
Archive for History of Exact Sciences, 2006 All early Indian lunar models, from about A.D. 450 – 650, used only one anomaly – the variation in speed of the Moon as it circles the zodiac. Unlike the Hipparchan model, which treated the same anomaly in terms of a single epicycle or its equivalent eccentric deferent, the Indian lunar (and solar) models without exception used the concentric equant ...
openaire +1 more source
A Youthful Titan Implied by Improved Impact Simulations
Geophysical Research Letters, Volume 53, Issue 3, 16 February 2026.Abstract The small number of impact craters found on Titan suggests that its surface is relatively young. Previous work estimated its surface age to be between 200 and 1000 Myr. This estimate, however, is based on crater scaling laws for water and sand, which are not representative of the composition of Titan's icy surface.
S. Wakita +3 more
wiley +1 more source
At What Time a Day Begins in the Korean History? [PDF]
Journal of Astronomy and Space Sciences, 2004 We have reproduced the records of lunar occultation recorded in the History of Three Kingdoms, the History of the Koryo Dynasty, the Annals of the Choson Dynasty, the Daily Records of Royal Secretariat of the Choson Dynasty, and obtained the epochs of ...
Sang-Hyeon Ahn, Jong Woo Park
doaj +1 more source