ASTR 103 Lecture 31: 6.4- Terrestrial Planets (cont.)

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School
Department
Course
Professor
Mercury
Looks+a+lot+like+the+moon
-
Most+amount+of+Iron-"The+Iron+Planet"
-
Characteristic
Relative+to+Earth+
(Earth=+1)
Absolute+value
Mass
.0553
3.03+x+10^16+g
.382
2,439+km
Mean+Density
5.43
Rotation+period
58.65+earth+day
Mean+orbital+distance
.3871+AU
57.91+x+10^6
Orbital+period
87.9+Earth+Days
Mean+orbital+velocity
1.6
47.89+km/s+(112,000+
mi/hr)
Orbital+eccentricity
.2056
Inclination+to+ecliptic+
(degrees)
7.004
Temperature+ranges
-360+degrees+F+to+840+
degrees+F
-
The+cold+side+is+incredibly+cold,+and+the+hot+side+is+incredibly+hot
No+atmosphere+to+carry+the+heat+around+the+planet
-
Orbital+period+and+rotational+period-Resonance
Relationship+between+the+two+(3-2+ratio+for+Mercury;+For+every+two+
orbits,+it+rotates+on+its+axis+three+times)
-
Orbital+period+is+very+high+because+it+is+so+close+to+the+Sun
-
Lobate+Scarps
Overlapping+of+the+crest+caused+by+planetary+shrinkage
-
Craters+are+a+little+ bit+smaller+than+on+the+Moon
-
Greater+gravity,+so+things+fall+quicker,+thereby+creating+craters+that+aren't+as+
large
-
No+moons+(natural+satellites)
-
Venus
Looks+very+different+in+different+lights
-
Characteristic Relative+to+Earth+
(Earth=+1)
Absolute+Value
Mass .815 4.867+x+10^27+g
Radius .949 6.046+km
Mean+density 5.24+g/cm^3
Rotation+period 243+Earth+days
Mean+orbital+distance .72+AU 108+x+10^6+km
Orbital+period 226+Earth+days
Mean+orbital+velocity 1.2 35.02+km/s+(78.338+m/hr)
Orbital+eccentricity .0067
Inclination+to+ecliptic+
(degrees)
3.39
Temperature+range 864+degrees+F+to+872+
degrees+F
-
Hottest+planet+in+the+solar+system
-
"Runaway+Greenhouse+Effect"
-
Uninhabitable
Mostly+carbon+dioxide
Greater+atmospheric+pressure
Clouds+rain+concentrated+sulfuric+acid
Too+hot+(would+burst+into+flames)
-
No+moons+(natural+satellites)
-
Mars
Characteristic Relative+to+Earth+
(Earth=+1)
Absolute+value
Mass .107 6.39+x+10^26+g
Radius .532 3,390+km
Mean+density 3.93+g/cm^3
Rotation+period 1.03+Earth+days
Mean+orbital+distance 1.52+AU 228+x+10^6+km
Orbital+period 1.88+Earth+years
Mean+orbital+velocity .81 24.07+km/s+(53,843+mi/hr)
Orbital+eccentricity .094
Inclination+in+ecliptic+
(degrees)
1.8
Temperature+range -204+degrees+F+to+80+
degrees+F
-
Some+parts+of+the+planet+actually+have+temperatures+that+we+could+live+in+(80+
degrees+F),+however+the+atmosphere+is+so+thin+that+we+could+not+actually+live+in+
those+areas
-
Mars+rovers
-
Discovered+volcanoes,+erosion,+evidence+for+glaciers,+etc.
-
Believed+they+saw+liquid+water+running+on+Mars
-
Hot+core+and+hot+surface+caused+convection+to+slow+and+magnetic+field+to+
minimize
-
Valles+Marineris
The+"Grand+Canyon"+of+Mars
-
Moons
Phobos
Deimos
-
!"#$%&''&()'*+,-.,+/&)(-012/)"3
Monday,+December+ 4,+2017
10:33+AM
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