mars yuk yung 3-14-05. earth: 13,000 km diameter 150 million km from sun 365 days in year 24 hours...
Post on 15-Jan-2016
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MarsYuk Yung3-14-05
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Earth: • 13,000 km diameter• 150 million km from sun• 365 days in year• 24 hours in day• -88 deg C to +58 deg C temp range• 1000 mb surface pressure• 78% nitrogen, 21% oxygen
Mars: • 7,000 km diameter• 1.5 AU from sun• 687 Earth-day year• 24 hour, 37 minute sol (Mars day)• -127 deg C to 17 deg C temp range• 7 mb surface pressure• 95% carbon dioxide atmosphere
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Number Density (cm-3)
Alt
itud
e (K
m)
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Candor Chasma,Valles Marineris MGS PhotographQaidam Basin, China SRTM Shaded Relief
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Mars MGS photograph; 43.2°N Lat, 90.6°W Long, in Tempe Terra
Afar Triangle, Ethiopia SRTM Shaded Relief
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Martian Crater on Elysium Planitia MGS Photograph
Bosumtwi Crater, Ghana, Africa SRTM shaded relief
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Gusev Crater, MarsCerro Armazones, Chile
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Meridiani PlanumSan Gabriel Mountains
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MSG MOC Image of “delta”system within Holden Crater on Mars (Malin et al, Science 2003)
Lena Delta in Siberia (NASA Scientific Data Purchase/Landsat 7)
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A Brief History of ALH84001• 4.5 Gy ago: Igneous rock (orthopyroxenite)
which accumulated in a magma chamber on Mars. Oldest known rock from ANY planet!
• From 4.5 – 4.0 Gy: Suffered several shocks, probably from asteroid or comet impacts, formed mm-thick, cataclastic “granular bands” at high temperature.
• ~4.0 Gy ago: Major shock event brecciated it, rotated fragments, but did not heat it.
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A Brief History of ALH84001, cont’d
• ~4.0 Gy ago: Carbonate blebs formed in cracks by low-T precipitation events. (Aqueous, followed by at least 1 shock.)
• 15 Myr ago: Blasted off of Mars into space by another impact
• ~11,000 years ago: After wandering through space, landed on Antarctic Ice sheet.
• ~500 years ago, exposed at surface in Allan Hills.
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Was this Martian ever alive??!!
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So what do the magnetite crystals in ALH84001 actually look like?
(Thomas-Keprta K.L., Bazylinski D.A., Kirschvink J.L., Clemett S.J., McKay D.S., Wentworth S.J., Vali H., Gibson E.K., Jr., and Romanek, C.S. Elongated Prismatic Magnetite Crystals in ALH84001
Carbonate Globules: Potential Martian Magnetofossils. Geochimica Cosmochimica Acta 64 (23), 4049-4081, 2000)
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€
N2++e→ N+N
O2++e→ O+O
E(0) = 2.5 ev or 7km/s
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Acknowledgements
• NASA
• NSF
• JPL
• Diane Michelangeli
• Chris Parkinson
• Yung’s Caltech Research group