Australasian tektite geographic pattern, crater and ray of origin, and theory of tektite events
Geographic distribution pattern of Australasian tektites, considering origin and crater theory of tektite events
Chapman, D. R.↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Origins of cosmic rays
Cosmic rays origin, discussing nuclear, electron and electromagnetic components, supernovae, pulsars, white dwarfs and gas motions in Galactic Center
Cowsik, R.↗
The origin of fluorine, sodium, and aluminum in the galactic cosmic radiation
F, Na and Al origin in galactic cosmic radiation, investigating production as spallation fragments and generation in source
Cartwright, B. G.↗
Origin of organic matter in early solar system. III - Amino acids- Catalytic synthesis
Early solar system organic matter origin, discussing amino acid synthesis from CO, H and ammonia reaction with N, alumina or clay catalysts
Anders, E.↗
Mineralogy, chemistry, and origin of the KREEP component in soil samples from the Ocean of Storms
Mineralogy, chemistry and origin of KREEP /potassium, rare earth element and phosphorus/ component in Apollo 12 soil and breccia samples from Ocean of Storms
Aitken, F. K.↗
Nature, occurrence, and exotic origin of 'gray mottled' /Luny Rock/ basalts in Apollo 12 soils and breccias
Gray mottled basaltic rock composition and origin in Apollo 12 lunar soils and breccias
Anderson, A. T., Jr.↗
Chemical composition and origin of nonmare lunar basalts
Nonmare basalts chemical composition and origin from Apollo 11 and 12 sites
Gast, P. W.↗
Influence of target temperature on crater morphology and implications on the origin of craters on lunar glass spheres
Lunar glass spheres cratering origin hypothesis from target temperature effects on crater morphology in targets impacted by high velocity Al projectiles
Carter, J. L.↗
Origin of the moon /Clarke Memorial Lecture/
Lunar origin hypothesis, discussing Apollo 11 crystalline rocks nature and basalts petrogenesis
Ringwood, A. E.↗
Origin, evolution and present thermal state of the moon
The relative absence of lunar volcanism in the last 3 b.y. and the Apollo 15 heat flow measurement suggest that present-day temperatures in the moon are approximately steady state to depths of 100 km. An exponential distribution of heat sources with depth is scaled by equating the surface heat flow to the integrated heat production of this exterior shell. Presumed present-day interior temperatures and the present-day surface heat flow of 30 ergs/cm2-sec are obtained. The estimated homogeneous concentrations of U, the chemistry of the lunar surface material and inferences to modest depth, and the short accretion time of the moon necessary to provide large-scale differentiation at 4.6 AE suggest that the moon had its origin in the rapid accretion of compounds first condensing from the protoplanetary nebula. The present thermal state of the moon may involve at least some partial melting through all the lunar interior deeper than 200 km. Such a thermal configuration is inconsistent neither with temperatures inferred from electrical conductivity studies nor with the nonhydrostatic shape of the moon.
Hanks, T. C.↗
Detection of interplanetary electrons from 18 keV to 1.8 MeV during solar quiet times, 1. On the origin of 200 KeV interplanetary electrons, 2.
A quiet time component of interplanetary electrons having energies above solar wind energies and below those characterized as cosmic radiation was observed. Its energy spectrum falls with energy from 18 keV to 1.8 MeV, but it shows a feature in the 100 to 300 keV range. The observed temporal variations of the intensity suggest that the 18 to 100 keV portion is solar and the 0.3 to 1.8 MeV portion is galactic in origin. Solar and terrestrial neutron decay electrons appear inadequate to explain the 100 to 300 keV feature.
Lin, R. P.↗
Origin and effects of electric fields during isolated magnetospheric substorms.
Balloon-measured electric-field data for five-hour periods during each of 19 substorms near local midnight have been analyzed and averaged. Results are applied to an improved model of the magnetospheric substorm in which the origin of the electric fields, the flow of cold plasma and magnetic-field lines, and many observed particle phenomena are more naturally explained.
Mozer, F. S.↗
Origin of strong magnetic fields.
A possible mechanism by which extremely strong magnetic fields in neutron stars and white dwarfs could originate involves the existence of thermodynamic equilibrium states (LOFER states) of an electron gas. The essence of the stability theory of a LOFER state is discussed. The extended electronic system considered is in contact with a thermal bath in the presence of an external magnetic field. It is found that it is not necessary to require absolute stability in order to realize a LOFER state in nature.
Canuto, V.↗
Interstellar molecules and the origin of life.
Synopsis of the various views expressed at the conference held at NASA Ames Research Center in February 1971 on the relationship of interstellar molecules to the origin of life, intended to provide a basis for future discussion and work in this area. The topics covered include: a summary of molecules discovered, the interstellar environment, laboratory measurements, chemical evolution, and exobiology.
Buhl, D.↗
Origin and early development of the planets.
Extensive numerical calculations have been carried out to determine the structure of the primitive solar nebula. The resulting structure shows a dominance of the radial pressure gradient near the center, and a dominance of the centrifugal forces throughout most of the outer region. Thermal convection and Eddington-Sweet circulation currents can be expected to cause a rapid dissipation of the disk, requiring only a few centuries. It is therefore postulated that the planets were formed in an exceedingly hot initial state due to their rapid rates of accumulation. Beyond one or two astronomical units from the center, the original interstellar grains should not be completely destroyed during the formation of the disk, and these will form the nuclei for subsequent chemical condensations and chemical accumulation. Inside this distance, nucleation of condensed materials must occur within the nebular gases.
Cameron, A. G. W.↗
On a galactic origin for the soft X-ray background.
Previous observations and some new data with high angular resolution are considered in the discussion of the galactic origin for the X-ray background. Aspects of instrumentation are discussed together with the observational results, and the parameters of a possible galactic distribution of point sources that would explain essentially all of the soft X-ray background. The excess flux at the poles is accounted for by the fact that the galactic distribution has a larger scale height than the interstellar gas.
Gorenstein, P.↗
Origin and evolution of the earth-moon system.
The general problem of formation of secondary bodies around a central body is studied, and comparison is made with other satellite systems (Jupiter, Saturn, Uranus). The normal satellite systems of Neptune and the earth are reconstructed. The capture theory, the tidal evolution of the lunar orbit, destruction of a normal satellite system, asteroids and the earth-moon system, and accretion and heat structure of the moon are discussed. It is concluded that the moon originated as a planet accreted in a jet stream near the orbit of the earth, and was probably captured in a retrograde orbit.
Alfven, H.↗
Origin of 200-keV interplanetary electrons.
The suggestion by Lin et al. (1972) that a distinct spectral feature exists at about 200 keV, which could be due to a neutron-decay electron component of either solar or galactic origin, is examined. Alternative sources models, including production by nearby galactic objects or acceleration at the outer boundary of the solar system, are also considered.
Ramaty, R.↗