Results 181 to 190 of about 4,877 (221)

Essential oils: a systematic review on revolutionizing health, nutrition, and omics for optimal well-being. [PDF]

Front Med (Lausanne)
Pezantes-Orellana C, German Bermúdez F, Matías De la Cruz C, Montalvo JL, Orellana-Manzano A.   +4 more
europepmc   +1 more source

On the origin of O₂ and other volatile species in comets

, 2018
Taquet, V, Furuya, K, Walsh, C, Van Dishoeck, EF   +3 more
openaire   +1 more source

Halogen abundance evidence for the formation and metasomatism of the primary lunar crust. [PDF]

Nat Commun
Jing JJ, Berndt J, Kuwahara H, Klemme S, van Westrenen W.   +4 more
europepmc   +1 more source

The Morphology of Volatile-rich Regoliths on Asteroids and Comets

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The volatile composition of comet C/2017 K2 (PanSTARRS)

2022
<p class="p1">We present high resolution spectra of comet C/2017 K2 (PanSTARRS) (hereafter 17K2), obtained using the upgraded high resolution spectrometer of the VLT, CRIRES<span class="s1">+</span>.
Manuela Lippi, Mathieu Vander Donckt, Emmanuel Jehin, Sara Faggi, Geronimo Luis Villanueva   +4 more
openaire   +1 more source

A volatility index for comets

Icarus, 1992
The variations in total brightness of a comet when it is most active, near perihelion, are presently used as the bases of a volatility index (VI) for short-period (SP) and long-period (LP) comets. Volatility does not correlate with period among the LP comets, and thereby shows no 'aging' effect; similarly, the VI measurements are the same for SP and ...
openaire   +1 more source

Solar nebula origin for volatile gases in Halley's comet

Icarus, 1990
The conditions for Comet Halley formation are presently considered in light of the application of physical and chemical processes in the solar nebula environments to the present data base on the composition of the comet's gases. Key molecular ratios are compared to solar nebula model predictions, and the nebular thermochemistry is quantified for a ...
Steffi Engel, Jonathan I. Lunine, John S. Lewis   +2 more
openaire   +1 more source

Radiation formation of a non-volatile comet crust

1988
Ion irradiation of the outer meters of a cometary surface can produce new molecular species in the solid state. Because of the interfaces with the interplanetary vacuum these species segregate in an irreversible way into a nonvolatile residue and new very volatile species.
R. E. Johnson, J. F. Cooper, L. J. Lanzerotti, G. Strazzulla   +3 more
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The vaporization of the volatile fraction in comets

International Astronomical Union Colloquium, 1974
AbstractVery large gas productions have been recently established for comets. They rule out desorption models of the cometary nucleus and strongly support the vaporization of an icy conglomerate. The vaporization theory of the cometary nucleus can also be used to predict, for different types of ice, the law of dependence of the non-gravitational force ...
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Solids and Volatiles in Comets

1999
Comets occupy a key position in the cycles of ices and dust in the Universe. Their nuclei have mostly kept intact the composition and morphology they had at their formation. The return of a comet close to the Earth and Sun is thus an appreciated opportunity to investigate the original state of the material which built up our Solar System.
openaire   +1 more source