mars now: ~ opposition (rises when?) magnitude -2.2
TRANSCRIPT
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MarsMars
Now: ~ opposition (rises when?) magnitude -2.2
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Popular InterestPopular Interest
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Past Past and and
presentpresent…… 1938: Radio 1938: Radio
broadcast broadcast of War of of War of the Worlds the Worlds panics USpanics US
2000: “Red 2000: “Red Planet”Planet”
2005 (and 2005 (and 1953) “War 1953) “War of the of the Worlds”Worlds”
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First First ObservationsObservations
First observed by Dutch physicist Christian Huygens, 1659
He noted…
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RotationRotation
Motion of the feature Syrtis Major and concluded P=24h
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Giovanni Cassini
Determined to be 24:37 who also saw the polar caps…
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Polar Ice CapsPolar Ice Caps
Ice cap Ice cap seen in seen in this this ground ground based based photophoto
Similar to Similar to view in view in scopescope
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Seasons and eccentricity Seasons and eccentricity
Seasons are affected (made more extreme) because perihelion occurs at Southern Hemisphere summer
This is unlike Earth seasons, since Earth’s orbital This is unlike Earth seasons, since Earth’s orbital eccentricity is smalleccentricity is small
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Eccentricity and Eccentricity and OppositionsOppositions
Causes Causes some some oppositions oppositions to be to be “favorable”“favorable”
September September 2003’s was 2003’s was especially especially favorablefavorable
Note angular Note angular size of Marssize of Mars
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Giovanni Schiaparelli First proposed that First proposed that
the caps made of the caps made of iceice
Became famous Became famous when he drew his when he drew his sketch of Mars in sketch of Mars in 1877 …1877 …
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““Canali” (Canali” (channels/canals)
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Percival LowellPercival Lowell
Wealth “Boston Wealth “Boston Brahman” (social Brahman” (social and cultural elite)and cultural elite)
Became Became interested in the interested in the Mars canals and Mars canals and established an established an observatory in observatory in Flagstaff, AZFlagstaff, AZ
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Lowell at the scopeLowell at the scope Drew on 6-inch globes Drew on 6-inch globes
to accommodate to accommodate perspectiveperspective
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Edward Barnard
In 1894 Edward Barnard and others could not convince himself the canals existed
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Mariner probes would resolveMariner probes would resolve
dust storm here frustrated first photos in 1971 Mariner 9
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When cleared…When cleared…
Many features Many features but none lined but none lined up with canals up with canals drawn by drawn by Schiaparelli or Schiaparelli or LowellLowell
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Possible explanation Possible explanation based on Lowell’s Venus based on Lowell’s Venus
“spokes”“spokes” Doctors noted that Doctors noted that
Lowell had Lowell had stopped his scope stopped his scope down to a few down to a few inches, effectively inches, effectively creating a pinhole creating a pinhole camera at eye, camera at eye, which displays which displays veins in retinaveins in retina
Similar to Similar to ophthalmoscope, ophthalmoscope, an instrument an instrument used to used to examine the examine the interior of the eye interior of the eye
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Craters discovered
Not evenly distributed…Not evenly distributed…
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Mostly in southern hemisphere
Dust has eroded rays and ejecta
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Volcanoes found
Volcanoes such as Arsia Mons shown above and...
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.. In perspective 3D
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The volcano Olympus Mons
rises 24 km (15 miles) above plains! (3x Mt Everest). Great size of volcanoes on both Venus and Mars suggests no
current plate tectonics ... same surface sits above hot spot.
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Tharsis Rise
Olympus Mons and other volcanos comprise the Tharsis Rise
Shown compared to eastern US here
Is an average of 5 - 6 km above most of surface
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Valley Marineris
4000 km long
Would span USA as shown
It is a huge crust fracture
not formed by water, but…
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These channels were formed by massive water
flow
But where is the water But where is the water now?...now?...
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Some water locked up in polar ice caps
South pole shown here During summer CO2 portion sublimates, leaving
H2O. (Temperature rises above sublimation point)
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color view of cap
shows ice melted off of sun-facing slopes, revealing strange terraced slopes
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North pole
this is almost all residual water ice shown here
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Broken terrain from outflow
in the Capri plateau, suggests water violently outgassed when heated by volcanic activity below
Like similar event in eastern Washington state 14,000 years ago that created the Channeled Scablands
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Some water seen in fogSome water seen in fog
Early morning fog in canyons
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1975-6: Two Viking Landers1975-6: Two Viking Landers
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Approaching MarsApproaching Mars
dawn view reveals clouds along volcano Olympus Mons, Valley Marineris
CO2 snow in Argyre Basin
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Viking I Lander View
Landed in Chryse Planitia (Golden Plains)
Shows edge of crater on horizon, probably responsible for jagged rocks in scene.
Foreground shows regolith covered with other rocks that under closer examination ...
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… …appear pocked (vesicular)
Suggests outgassing during igneous formation
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Weather Report from marsWeather Report from mars
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Other ResultsOther Results
95% CO2, 2% N2, 1.6% Argon 6-8 mBar pressure (Earth: 1000 mB) no ozone layer no magnetic field (therefore no iron core,
also supported by low avg density 3.9) large temp swings ... -80OC to -20O C in
warmer areas! seasonal pressure variationss as CO2
freezes out/sublimates
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Scoop Delivered Soil to Scoop Delivered Soil to ExperimentsExperiments
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Geological ResultsGeological Results
surface rich in iron (magnet) --> rust red!
silicon --> 2/3 of Mars.. little interior info since one
seismometer failed...
Biological…
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gas-exchange
Sensed respiration of samples (used gas-chromatograph/mass spectrometer)
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labeled release
Used radioactive carbon nutrients -- checked for metabolism...
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pyrolytic-release
Checked for photosynthesis with radioactive CO2 and artificial sunlight
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Biological ResultsBiological Results
no life found active chemical reactions believed
due to release of peroxides & superoxides
surface is literally antiseptic!
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MagnetosphereMagnetosphere
almost no magnetic field Thus, core, if iron, not liquid, since Prot ~ PEarth Thus solar wind and cosmic rays hit surface
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July 1997: PathfinderJuly 1997: Pathfinder
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Mars Global Surveyor
Imaging Mars from an orbit around itImaging Mars from an orbit around it Recent image of delta-like fansRecent image of delta-like fans
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Other probes…Other probes… Mars Mars
Exploration Exploration Rover Rover SpiritSpirit and and OpportunityOpportunity landed in landed in January, 2004January, 2004
Mars Odyssey Mars Odyssey continues to map continues to map Mars in infraredMars in infrared
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Rover AssignmentRover Assignment
Write up, in < 1 typed page…Write up, in < 1 typed page… Current mission status (a paragraph)Current mission status (a paragraph) 5 interesting things about the mission5 interesting things about the mission Use the Use the linklink on our WebCT Class Links on our WebCT Class Links
pagepage Due next time (make a copy for Due next time (make a copy for
yourself so we can discuss it)yourself so we can discuss it)
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Asaph Asaph HallHall
Discovered two moons in 1877 favorable opposition using the 26-inch refractor at the USNO, in Washington, DC
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150 years before the were 150 years before the were “predicted” in Gulliver’s “predicted” in Gulliver’s
TravelsTravels““They have likewise discovered two lesser They have likewise discovered two lesser
Stars, or Stars, or SatellitesSatellites, which revolve about , which revolve about MarsMars; whereof the innermost is distant from ; whereof the innermost is distant from the Center of the primary Planet exactly the Center of the primary Planet exactly three of his Diameters, and the outermost three of his Diameters, and the outermost five; the former revolves in the space of ten five; the former revolves in the space of ten Hours, and the latter in Twenty-one and an Hours, and the latter in Twenty-one and an Half; so that the Squares of their periodical Half; so that the Squares of their periodical Times, are very near in the same Proportion Times, are very near in the same Proportion with the Cubes of their Distance from the with the Cubes of their Distance from the Center of Center of MarsMars; which evidently shews them ; which evidently shews them to be governed by the same Law of to be governed by the same Law of Gravitation, that influences the other Gravitation, that influences the other heavenly Bodies. “heavenly Bodies. “
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PhobosPhobos
Phobos is nearer and larger, P = 7:39! – rise to set in 5h!
Not spherical – why not?
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DeimosDeimos
Almost Marsynchronous -- appears to take 3 days horizon to horizon.