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Mega-impact formation of the Mars hemispheric dichotomy
Summary from United States, from articles in English
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Isostatic modelling combining gravity and topography have provided a description of global crustal thickness in which the northern lowlands are distinguished from the southern highlands by a reduction in crustal thickness of 30 km (ref 1). (article 6)
The Mars hemispheric dichotomy is expressed as a dramatic difference in elevation, crustal thickness and crater density between the southern highlands and northern lowlands (which cover 42% of the surface) 1, 2. (article 5)
Later spacecraft measurements 1, 2 confirmed a relatively abrupt increase in both elevation and crustal thickness 50-80 degrees (3,000-4,750 km) from the putative impact centre, and an antipodal decline in magnetic field strength (Fig. 1). (article 7)
NEW YORK - The lopsided shape of Mars might well be a result of a cataclysmic impact of a Pluto-size meteor billions of years ago, three teams of scientists are reporting. (article 1)
Other studies suggested that a number of impacts could be arranged to reproduce the dichotomy boundary 6, although evidence for the individual basins is lacking 1, 12. (article 4)
Its southern highlands cover about two-thirds of the planet and are on average about 4 kilometres higher than the northern plains, a difference that is known as the hemispheric dichotomy 1 (Fig. 1). (article 3)
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Other stories about Impact, Mars and Space:
Event tracking:
Story keywords
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Impact, Mars, Space, Planet, NASA |
Source articles
- Asteroid may have had impact on Mars (boston.com, 06/26/2008, 311 words)
- Giant asteroid may explain origins of Mars landscape (seattletimes.nwsource.com, 06/26/2008, 301 words)
- Planetary science: Forming the martian great divide (Nature Journals, 06/25/2008, 1347 words)
- The Borealis basin and the origin of the martian crustal dichotomy (Nature Journals, 06/26/2008, 1984 words)
- Mega-impact formation of the Mars hemispheric dichotomy (Nature Journals, 06/26/2008, 302 words)
- Mega-impact formation of the Mars hemispheric dichotomy (Nature Journals, 06/26/2008, 1685 words)
- Implications of an impact origin for the martian hemispheric dichotomy (Nature Journals, 06/26/2008, 1557 words)
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blaster@cs.columbia.edu
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