منابع مشابه
Meteoritic Evidence for Extensive Compositional Variability on the Moon
Introduction: Crystallization of the lunar magma ocean occurred ~4.4 Ga [e.g., 1-4] and produced three principal magma source regions [5-6]. These sources are characterized chemically by low titanium (Ti), high Ti, and high potassium, rare earth element, and phosphorous (KREEP) abundances. The KREEP component was produced after nearly complete solidification of the magma ocean and is highly enr...
متن کاملNickel on Mars: Constraints on meteoritic material at the surface
[1] Impact craters and the discovery of meteorites on Mars indicate clearly that there is meteoritic material at the Martian surface. The Alpha Particle X-ray Spectrometers (APXS) on board the Mars Exploration Rovers measure the elemental chemistry of Martian samples, enabling an assessment of the magnitude of the meteoritic contribution. Nickel, an element that is greatly enhanced in meteoriti...
متن کاملLetter to the Editor A search for meteoritic flashes on the Moon
We present the first results of a search for bright flashes associated to impacts of meteoroids on the surface of the night side of the Moon. We have analysed 13 sets of images of a (2.9±0.3) 106-km2-wide area on the Moon’s night side, totaling 4.3 h of observations. No impact events radiating an amount of energy higher than 5×106 J have been detected. Five fainter events (E < 2.5 × 106 J) have...
متن کاملSearch for fractional-charge particles in meteoritic material.
We have used an automated Millikan oil drop method to search for free fractional-charge particles in a sample containing in total 3.9 mg of pulverized Allende meteorite suspended in 259 mg of mineral oil. The average diameter of the drops was 26.5 microm with the charge on about 42 500 000 drops being measured. This search was motivated by the speculation that isolatable, fractional-charge part...
متن کاملTalking on the Moon
How effective, efficient and natural human-robot interaction can be depends for an important part on how meaning can be shared and construed between a human and a robot. The paper presents an initial investigation in the architectural functions that appear to underly embodied, situated understanding in joint action and interaction. The identified functions are combined into a concept system arc...
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ژورنال
عنوان ژورنال: The Moon
سال: 1973
ISSN: 0027-0903,1573-0794
DOI: 10.1007/bf00562747