Mars - The intermediate between earth and moon
The present work represents a summary of the state of our knowledge concerning the chief physical characteristics of Mars as deduced from existing observational and theoretical evidence. Two main geological provinces are distinguished on Mars: areas of rough terrain and dense cratering, and smooth a...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19740059900 2023-05-15T17:39:51+02:00 Mars - The intermediate between earth and moon Opik, E. J. Unclassified, Unlimited, Publicly available Sep 1, 1973 http://ntrs.nasa.gov/search.jsp?R=19740059900 unknown http://ntrs.nasa.gov/search.jsp?R=19740059900 Accession ID: 74A42650 Copyright Other Sources 30 Irish Astronomical Journal; 11; Sept 1973 ftnasantrs 2012-02-15T11:55:20Z The present work represents a summary of the state of our knowledge concerning the chief physical characteristics of Mars as deduced from existing observational and theoretical evidence. Two main geological provinces are distinguished on Mars: areas of rough terrain and dense cratering, and smooth areas comparable to lunar maria. A thermal model for the Martian poles which takes into account convective transport would indicate that the CO2 frost over the north pole is not permanent, lasting about 420 days with the water frost lasting the remaining 267 days of the Martian year. The meandering appearance of Martian rift valleys are cracks probably produced, as also in the case of lunar rilles, by stresses, perhaps in solidifying lava of impact origin, and not by erosional river beds. Data indicate a strong absorption in the thin Martian atmosphere. The atmospheric blue and violet cap around a Martian pole in winter is interpreted as a 'blue clearing' of the atmosphere increasing transparency so that surface detail of higher albedo shines through in the blue. Other/Unknown Material North Pole NASA Technical Reports Server (NTRS) North Pole |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
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30 |
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30 Opik, E. J. Mars - The intermediate between earth and moon |
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30 |
description |
The present work represents a summary of the state of our knowledge concerning the chief physical characteristics of Mars as deduced from existing observational and theoretical evidence. Two main geological provinces are distinguished on Mars: areas of rough terrain and dense cratering, and smooth areas comparable to lunar maria. A thermal model for the Martian poles which takes into account convective transport would indicate that the CO2 frost over the north pole is not permanent, lasting about 420 days with the water frost lasting the remaining 267 days of the Martian year. The meandering appearance of Martian rift valleys are cracks probably produced, as also in the case of lunar rilles, by stresses, perhaps in solidifying lava of impact origin, and not by erosional river beds. Data indicate a strong absorption in the thin Martian atmosphere. The atmospheric blue and violet cap around a Martian pole in winter is interpreted as a 'blue clearing' of the atmosphere increasing transparency so that surface detail of higher albedo shines through in the blue. |
format |
Other/Unknown Material |
author |
Opik, E. J. |
author_facet |
Opik, E. J. |
author_sort |
Opik, E. J. |
title |
Mars - The intermediate between earth and moon |
title_short |
Mars - The intermediate between earth and moon |
title_full |
Mars - The intermediate between earth and moon |
title_fullStr |
Mars - The intermediate between earth and moon |
title_full_unstemmed |
Mars - The intermediate between earth and moon |
title_sort |
mars - the intermediate between earth and moon |
publishDate |
1973 |
url |
http://ntrs.nasa.gov/search.jsp?R=19740059900 |
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Unclassified, Unlimited, Publicly available |
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North Pole |
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North Pole |
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North Pole |
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North Pole |
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Other Sources |
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http://ntrs.nasa.gov/search.jsp?R=19740059900 Accession ID: 74A42650 |
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Copyright |
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1766140622964523008 |