What's More
Mass (1024kg)
Diameter (km)
Density (kg/m3)
Gravity (m/s2)
12,104
Activity 1.1 Understanding Planet Earth
Compare and Contrast
How is planet Earth similar and different from Venus and Mars? Provide possible
explanations for your observations using the information in the
table.
VENUS
4.87
EARTH
MARS
5.97
0.642
12,756
6792
5243
5514
3933
8.9
9.8
3.7
Escape Velocity (km/s)
10.4
11.2
5
Surface pressure (bars)
92
1
0.01
Composition of atmosphere
96% CO2, 3.5% N
77%N, 21% 02, 1%Ar
95% CO2, 2.7%N,
1.6% Ar
Major Greenhouse Gases (GHG)
CO2
CO2 H20
CO2
Mean Temperature (OC)
464
15
-65
Temperature if no greenhouse gases
are present
-46
-18
-57
Changes in Temperature (OC) due to
+523
+33
+10
greenhouse gases
Distance from the Sun (106km)
108.2
149.6
227.9
Orbital Period (days)
224.7
365.2
687
Orbital Velocity (km/s)
35
29.8
24.1