Results 171 to 180 of about 15,669 (223)
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The Moon, 1976
An analysis has been made of the tendency of large lunar craters to lie along circles. A catalog of the craters at least 50 km in diameter was prepared first, noting position, diameter, rim sharpness and completion, nature of underlying surface, and geological age.
L. D. Jaffe, E. O. Bulkley
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An analysis has been made of the tendency of large lunar craters to lie along circles. A catalog of the craters at least 50 km in diameter was prepared first, noting position, diameter, rim sharpness and completion, nature of underlying surface, and geological age.
L. D. Jaffe, E. O. Bulkley
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Nuncius, 2020
Abstract This article traces the story of three amateur astronomers who created relief models to help them depict the changing illumination of certain lunar craters, examples of which can be found in UK museum collections today. English chemist Henry Blunt (1806–1853) adopted the emerging technology of electrotyping to reproduce and distribute his ...
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Abstract This article traces the story of three amateur astronomers who created relief models to help them depict the changing illumination of certain lunar craters, examples of which can be found in UK museum collections today. English chemist Henry Blunt (1806–1853) adopted the emerging technology of electrotyping to reproduce and distribute his ...
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Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1977
The form of the lunar impact crater size-frequency distribution is discussed. Latest results on the lunar cratering chronology in the first 1.5 Ga after its formation are reviewed. It is shown that most cratering arguments speak against an extraordinary high flux increase (‘cataclysm’) at ca . 4 Ga ago.
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The form of the lunar impact crater size-frequency distribution is discussed. Latest results on the lunar cratering chronology in the first 1.5 Ga after its formation are reviewed. It is shown that most cratering arguments speak against an extraordinary high flux increase (‘cataclysm’) at ca . 4 Ga ago.
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Proceeding of the 2011 IEEE International Conference on Space Science and Communication (IconSpace), 2011
This project focuses on identification of craters in terms of its characteristics and detection of these visual features of the moon to determine a safe landing site for a lunar Lander. Cheng et al. proposed using craters as landmarks for navigation purposes because this geometric model grants a robust detection under different lighting conditions ...
Nur Diyana Kamarudin +2 more
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This project focuses on identification of craters in terms of its characteristics and detection of these visual features of the moon to determine a safe landing site for a lunar Lander. Cheng et al. proposed using craters as landmarks for navigation purposes because this geometric model grants a robust detection under different lighting conditions ...
Nur Diyana Kamarudin +2 more
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Icarus, 1970
Abstract Solidification ages from Apollo rock samples plus the present-day impact rate are used to derive the time-behaviour of lunar cratering. Indications of three different families of impacting bodies are discussed.
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Abstract Solidification ages from Apollo rock samples plus the present-day impact rate are used to derive the time-behaviour of lunar cratering. Indications of three different families of impacting bodies are discussed.
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Icarus, 1966
Abstract During the first seventh of lunar history, the cratering rate on the Moon averaged roughly two hundred times the average post-mare rate. The peak rate may have been much higher. Crater densities are thus not proportional to age. The large, circular mare basins fit the diameter distribution of the “continental” craters and are thus identified
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Abstract During the first seventh of lunar history, the cratering rate on the Moon averaged roughly two hundred times the average post-mare rate. The peak rate may have been much higher. Crater densities are thus not proportional to age. The large, circular mare basins fit the diameter distribution of the “continental” craters and are thus identified
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Icarus, 1969
Abstract Measurement of crater circularity for 487 craters has shown that there are at least two populations of craters, the circularity of which appears to decrease with increasing age. Central peak formation is not confined to either population, but the subcircular population appears to be located preferentially around the circular maria.
Joel E.M. Adler, John W. Salisbury
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Abstract Measurement of crater circularity for 487 craters has shown that there are at least two populations of craters, the circularity of which appears to decrease with increasing age. Central peak formation is not confined to either population, but the subcircular population appears to be located preferentially around the circular maria.
Joel E.M. Adler, John W. Salisbury
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Human Factors: The Journal of the Human Factors and Ergonomics Society, 1967
Recognition thresholds for lunar crater size were determined, analytically, for various look angles and magnifications, at an orbital altitude of 80 nautical miles. Elliptical image measurements for various sized craters were combined with some previous threshold recognition data for the ellipse (Casperson, 1950).
James Wilde +2 more
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Recognition thresholds for lunar crater size were determined, analytically, for various look angles and magnifications, at an orbital altitude of 80 nautical miles. Elliptical image measurements for various sized craters were combined with some previous threshold recognition data for the ellipse (Casperson, 1950).
James Wilde +2 more
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Physical properties of lunar craters
Research in Astronomy and Astrophysics, 2017The surface of the Moon is highly cratered due to impacts of meteorites, asteroids, comets and other celestial objects. The origin, size, structure, age and composition vary among craters. We study a total of 339 craters observed by the Lunar Reconnaissance Orbiter Camera (LROC).
Maitri P. Joshi +2 more
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The Moon, 1976
Numerous lunar craters (206 examples, mean diameter = 40km) contain pronounced floor rilles (fractures) and evidence for volcanic processes. Seven morphologic classes have been defined according to floor depth and the appearance of the floor, wall, and rim zones.
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Numerous lunar craters (206 examples, mean diameter = 40km) contain pronounced floor rilles (fractures) and evidence for volcanic processes. Seven morphologic classes have been defined according to floor depth and the appearance of the floor, wall, and rim zones.
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