Results 181 to 190 of about 312,980 (227)
Deficiencies in the Fanconi anemia or homologous recombination pathway enhance the antitumor effects of the hypoxia-activated prodrug CP-506. [PDF]
Mol Ther OncolSchuitmaker L +15 more
europepmc +1 more source
Oxybenzone (Benzophenone-3) Induces Antioxidant Responses and DNA Strand Breakage in <i>Aiptasia pallida</i>, a Coral Research Model Organism. [PDF]
ToxicsBabatunde ET +5 more
europepmc +1 more source
The size distribution of Jupiter Family comet nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2011 We present an updated cumulative size distribution (CSD) for Jupiter Family comet (JFC) nuclei, including a rigourous assessment of the uncertainty on the slope of the CSD. The CSD is expressed as a power law, N(>r_N) \propto r_N^{-q}, where r_N is the radius of the nuclei and q is the slope.
Colin Snodgrass +2 more
exaly +9 more sources
Loss of the Surface Layers of Comet Nuclei [PDF]
Space Sciences Series of ISSI, 2008 The Deep Impact observations of low thermal inertia for comet 9P/Tempel 1 are of profound importance for the observations to be made by the Rosetta spacecraft at comet 67P/Churyumov-Gerasimenko. While sub-surface sublimation is necessary to explain the observations, the depth at which this occurs is no more than 2–3 cm and possibly less.
Nicolas Thomas
exaly +8 more sources
Astrophysical Journal, 1990 The evolution of a comet nucleus is investigated, taking into account the crystallization process by which the gas trapped in the ice is released to flow through the porous ice matrix. The equations of conservation of the energy and of the masses of ice and gas are solved throughout the nucleus, to obtain the evolution of the temperature, gas pressure
D Prialnik
exaly +3 more sources
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Science, 1982
Photography of the nucleus of comet Halley is the goal of several planned space missions. The nucleus of a comet is surrounded by a cloud of dust particles. If this cloud is optically thick, it will prevent observation of the nuclear surface. Broadband photometry of nine comets has been analyzed to determine the visibility of their nuclei.
E P Ney
exaly +3 more sources
Photography of the nucleus of comet Halley is the goal of several planned space missions. The nucleus of a comet is surrounded by a cloud of dust particles. If this cloud is optically thick, it will prevent observation of the nuclear surface. Broadband photometry of nine comets has been analyzed to determine the visibility of their nuclei.
E P Ney
exaly +3 more sources
Solar System Research, 2009
Results of space missions to in-situ study comets and the derived current challenges to better understand the properties of comet nuclei are discussed and summarized shortly, particularly in view of the origin of comets in the protoplanetary disk. The main conclusion is that we are far away from a complete understanding of comets.
D Möhlmann
exaly +3 more sources
Results of space missions to in-situ study comets and the derived current challenges to better understand the properties of comet nuclei are discussed and summarized shortly, particularly in view of the origin of comets in the protoplanetary disk. The main conclusion is that we are far away from a complete understanding of comets.
D Möhlmann
exaly +3 more sources
Research Notes of the AAS, 2020
Abstract Centaurs are an interesting class of small bodies orbiting between Jupiter and Neptune. Several show some sort of activity and are classified as comets, in addition to minor planets. However, is activity a sufficient criterion for comet classification? The ancient definition of a comet as a small body orbiting the Sun that shows
Daniel C. Boice, Panida Boonmasai
openaire +1 more source
Abstract Centaurs are an interesting class of small bodies orbiting between Jupiter and Neptune. Several show some sort of activity and are classified as comets, in addition to minor planets. However, is activity a sufficient criterion for comet classification? The ancient definition of a comet as a small body orbiting the Sun that shows
Daniel C. Boice, Panida Boonmasai
openaire +1 more source
Note on the structure of comet nuclei
Planetary and Space Science, 1999Abstract The recent developments in cometary studies suggest rather low mean densities and weak structures for the nuclei. They appear to be accumulations of fairly discrete units loosely bound together, as deduced from the observations of Comet Shoemaker–Levy 9 during its encounter with Jupiter. The compressive strengths deduced from comet splitting
Fred L Whipple
exaly +2 more sources