Zobrazeno 1 - 10
of 166
pro vyhledávání: '"William K. Hartmann"'
Autor:
William K. Hartmann
Publikováno v:
Geosciences, Vol 9, Iss 7, p 285 (2019)
This study examines the history of the paradigm concerning a lunar (or solar-system-wide) terminal cataclysm (also called “Late Heavy Bombardment” or LHB), a putative, brief spike in impacts at ~3.9 Ga ago, preceded by low impact rates. We examin
Externí odkaz:
https://doaj.org/article/5c50d9de51ac4aea9105daeb2cf77623
Autor:
William K. Hartmann
The use of impact crater densities to estimate the ages of planetary surfaces began in the 1960s. Some predictive successes have been confirmed with radiometric dating of sites on the Moon and Mars. The method is highly dependent on our understanding
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c23a9b1af8c32a7b36ee3e2268e67d8
https://doi.org/10.1093/acrefore/9780190647926.013.252
https://doi.org/10.1093/acrefore/9780190647926.013.252
Autor:
William K. Hartmann
Publikováno v:
Journal of Astronomical History and Heritage. 22:553-555
Impact rates in the first 500 Myr of the solar system are critical to an understanding of lunar geological history, but they have been controversial. The widely accepted, post-Apollo paradigm of early lunar impact cratering (ca. 1975-2014) proposed v
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::14b683a15d45d1ece0de20eee7ce68aa
http://arxiv.org/abs/2010.14275
http://arxiv.org/abs/2010.14275
Publikováno v:
Meteoritics & Planetary Science. 53:2243-2246
Publikováno v:
Meteoritics & Planetary Science. 53:672-686
Autor:
Ingrid Daubar, William K. Hartmann
Publikováno v:
Meteoritics & Planetary Science. 52:493-510
New information has been obtained in recent years regarding formation rates and the production size-frequency distribution (PSFD) of decameter-scale primary Martian craters formed during recent orbiter missions. Here we compare the PSFD of the curren
Autor:
S. J. Kortenkamp, William K. Hartmann
Publikováno v:
Icarus. 275:239-248
Recent concerns about the giant impact hypothesis for the origin of the Moon, and an associated “isotope crisis” may be assuaged if the impactor was a local object that formed near Earth. We investigated a scenario that may meet this criterion, w
Publikováno v:
Journal of Geophysical Research: Planets. 121:1118-1140