Search Results - "Chyba, C."

Empirical constraints on the salinity of the europan ocean and implications for a thin ice shell by Hand, Kevin P., Chyba, Christopher F.

“…Induced electrical currents within Europa inferred from Galileo spacecraft magnetometer instrument data have been interpreted as due to a salty europan ocean…”
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Possible Ecosystems and the Search for Life on Europa by Chyba, Christopher F., Phillips, Cynthia B.

“…Chyba and Phillips examine Europa's suitability for life and consider candidate ecosystems that seem plausible in light of current knowledge. Life detection…”
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The Early Faint Sun Paradox: Organic Shielding of Ultraviolet-Labile Greenhouse Gases by Sagan, Carl, Chyba, Christopher

“…Atmospheric mixing ratios of ∼10$^{-5\pm1}$ for ammonia on the early Earth would have been sufficient, through the resulting greenhouse warming, to counteract…”
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Joule heating of the south polar terrain on Enceladus by Hand, K. P., Khurana, K. K., Chyba, C. F.

“…We report that Joule heating in Enceladus, resulting from the interaction of Enceladus with Saturn's magnetic field, may account for 150 kW to 52 MW of power…”
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Amino acid survival in large cometary impacts by PIERAZZO, E., CHYBA, C. F.

“…— A significant fraction of the Earth's prebiotic volatile inventory may have been delivered by asteroidal and cometary impacts during the period of heavy…”
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Planetary science. Life without photosynthesis by Chyba, C F, Hand, K P

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Cometary Delivery of Biogenic Elements to Europa by Pierazzo, E., Chyba, C.F.

“…Jupiter's moon Europa may harbor an ocean beneath its ice cover, but the composition of that ocean and the overlying ice is nearly entirely unknown. Regardless…”
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correction: Energy for microbial life on Europa by Chyba, C

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Standardized protocols increase organ and tissue donation rates in the neurocritical care unit by HELMS, A. K, TORBEY, M. T, HACEIN-BEY, L, CHYBA, C, VARELAS, P. N

“…The authors tested the effect of uncoupling and removal of the treating physician from organ and tissue donation requests on consent rates for donation in the…”
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Biological security in a changed world by Chyba, C F

“…The horrifying events of Sept 11, 2001, serve notice that civilization will confront severe challenges in the 21st century. National security now must address…”
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The Origin of Life in the Solar System: Current Issues by Chyba, C F, McDonald, G D

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Europa as an abode of life by Chyba, Christopher F, Phillips, Cynthia B

“…Life as we know it on Earth depends on liquid water, a suite of 'biogenic' elements (most famously carbon) and a useful source of free energy. Here we review…”
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Life on other moons by Chyba, Christopher F

“…Williams et al in a study present information that suggests that extrasolar giant planets that have been found around nine main-sequence stars might provide…”
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The 1908 Tunguska explosion - Atmospheric disruption of a stony asteroid by Chyba, Christofer F., Thomas, Paul J., Zahnle, Kevin J.

“…The explosion over Tunguska, Central Siberia, in 1908 released 10 to 20 megatons (high explosive equivalent) of energy at an altitude of about 10 km. This…”
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Cometary Delivery of Organic Molecules to the Early Earth by Chyba, Christopher F., Thomas, Paul J., Brookshaw, Leigh, Sagan, Carl

“…It has long been speculated that Earth accreted prebiotic organic molecules important for the origins of life from impacts of carbonaceous asteroids and comets…”
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The cometary contribution to the oceans of primitive earth by Chyba, Christopher F.

“…The total mass incident on the moon during the period of heavy bombardment is estimated on the basis of recent compilations of the lunar impact record,…”
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Impact delivery and erosion of planetary oceans in the early inner solar system by Chyba, Christopher F.

“…The terrestrial planets may have acquired oceans of water (and other surface volatiles) as a late-accreting veneer from impacts of comets and carbonaceous…”
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Persistence of thin ice regions in Europa's ice crust by Buck, Leon, Chyba, Christopher F., Goulet, Marc, Smith, Alex, Thomas, Paul

“…Extensive data from planetary spacecraft as well as celestial mechanics models support the existence of a subsurface ocean on Europa ∼100 km thick, maintained…”
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Origins of life A left-handed Solar System? by Chyba, Christopher F

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Energy for microbial life on Europa by Chyba, Christopher F

“…The planet Jupiter's moon Europa may harbour a subsurface water ocean, but estimates of the available free energy have not been encouraging for supporting…”
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