Results 121 to 130 of about 549,270 (251)

Palaeolithic extinctions and the Taurid Complex

, 2010
Intersection with the debris of a large (50-100 km) short-period comet during the Upper Palaeolithic provides a satisfactory explanation for the catastrophe of celestial origin which has been postulated to have occurred around 12900 BP, and which ...
Asher, Asher, Babadzhanov, Babadzhanov, Babadzhanov, Babadzhanov, Beech, Boroviçka, Brown, Campbell-Brown, Chyba, Clarke, Clube, Denning, Desvoivres, Di Sisto, Dubietis, Faith, Firestone, Firestone, Franzén, Gill, Gladman, Grady, Harris, Haynes, Hughes, Ishiguro, Jenniskens, Jenniskens, Jenniskens, Kasuga, Kennett, Kresák, Kresák, Levasseur-Regourd, Luu, Mahaney, McBride, Morbidelli, Napier, Napier, Porubc̆an, Porubc̆an, Reach, Sekanina, Steel, Steel, Stuart, Terentjeva, Toon, Trigo-Rodrigues, W. M. Napier, Whipple, Wiegert, Zook, Öpik, Štohl   +57 more
core   +1 more source

Water in Comet 2/2003 K4 (LINEAR) with Spitzer

, 2007
We present sensitive 5.5 to 7.6 micron spectra of comet C/2003 K4 (LINEAR) obtained on 16 July 2004 (r_{h} = 1.760 AU, Delta_{Spitzer} = 1.409 AU, phase angle 35.4 degrees) with the Spitzer Space Telescope.
Bockelee-Morvan D., Bockelee-Morvan D., Bockelee-Morvan D., Capria M. T., Charles E. Woodward, Crovisier J., Dominique Bockelee‐Morvan, Eberhardt P., Jacquinet-Husson N., Michael S. Kelley, R. D. Gehrz, Spoon H. W. W.   +11 more
core   +3 more sources

Comets [PDF]

The IUE was used to study comets including the first dynamically new comet to approach closer than 3 AU. Differences between old and new comets are studied. Results relevant to the nature of cometary nuclei are discussed. Identification of species in the
Ahearn, Michael F.
core   +1 more source

Investigating Local- and Global-scale Dust Redistribution on Comet 67P/Churyumov–Gerasimenko

The Planetary Science Journal
We use a 3D dynamical Monte Carlo model to simulate the trajectories of individual dust grains and map their redeposition across the surface of comet 67P/Churyumov–Gerasimenko.
Jacob L. Kloos, Tony L. Farnham, Jessica M. Sunshine, Juan Luis Rizos   +3 more
doaj   +1 more source

Estimates of DNA damage by the comet assay in the direct-developing frog Eleutherodactylus johnstonei (Anura, Eleutherodactylidae)

Genetics and Molecular Biology, 2011
The aim of this study was to use the Comet assay to assess genetic damage in the direct-developing frog Eleutherodactylus johnstonei. A DNA diffusion assay was used to evaluate the effectiveness of alkaline, enzymatic and alkaline/enzymatic treatments ...
Laura Carolina Valencia, Adriana García, Martha Patricia Ramírez-Pinilla, Jorge Luis Fuentes   +3 more
doaj  

Predictions for Sparse Photometry of Jupiter-family Comet Nuclei in the LSST Era

The Planetary Science Journal
The Legacy Survey of Space and Time (LSST) at Vera C. Rubin Observatory will deliver high-quality, temporally sparse observations of millions of solar system objects on an unprecedented scale.
A. Donaldson, C. Snodgrass, R. Kokotanekova, A. Rożek   +3 more
doaj   +1 more source

On measuring the size of nuclei of comets

, 2014
Possibilities of measuring the size of nuclei of comets hidden by dust clouds are discussed. To this end, the dust cloud should be irradiated with a flow of rods accelerated in a linear mass accelerator to the velocity six kilometers per second. Each rod should be equipped with a transmitter with a power of one microwatt, which is destroyed in a ...
openaire   +2 more sources

Bulk Properties and Evolution of Jupiter-Family Comet Nuclei [PDF]

, 2018
This thesis presents the results from photometric time-series observations of Jupiter-family comets (JFCs). A method was developed that allows mutual absolute photometric calibration of data taken at different epochs with different instruments and results in absolute-calibration uncertainty of ∼0.02 mag.
openaire   +1 more source

Cryogenic Differential Calorimetry: Exothermicity of Amorphous-to-crystalline Phase Transitions (ACPT) in Astrophysical and Cometary Ice Analogs

The Astrophysical Journal
Amorphous ice is understood to be the predominant phase of water in cometary nuclei. A significant number of other volatiles can be trapped in amorphous H _2 O ice and released during the amorphous-to-crystalline phase transition (ACPT).
Rahul K. Kushwaha, Murthy S. Gudipati, Bryana L. Henderson   +2 more
doaj   +1 more source

The Oort cloud [PDF]

Views of the large-scale structure of the solar system, consisting of the Sun, the nine planets and their satellites, changed when Oort demonstrated that a gigantic cloud of comets (the Oort cloud) is located on the periphery of the solar system.
Marochnik, Leonid S., Mukhin, Lev M., Sagdeev, Roald Z.   +2 more
core   +1 more source