Page 204 - Science Course 3 (Book 2)

Mo13-L2a: How are the Inner Planets Similar?

Mercury No Atmosphere

Mercury is the smallest planet and the planet closest Exosphere Containing
to the Sun. 42% Oxygen
29% Sodium
22% Hydrogen
6% Helium Mercury size
0.5% Potassium compared to Earth

Key Concept
How are the Inner Planets Similar?

How are the inner planets similar?

Mercury 427 0C
Distance from Sun:
0.39 AU(58,000,000 km)
Length of Day:
175.9 Earth days
Length of Year:
88 Earth days
Type: –173 0C
Terrestrial
0 Moon 0 Rings Surface
Temperature SUMMARY
Mercury’s gravity is not strong enough to hold an How are the Inner Planets Similar?
atmosphere.
The terrestrial planets include Mercury,
Mercury’s temperatures are as high as 450°C on the Venus, Earth, and Mars.
side toward the Sun and as low as –170°on the side
away from the Sun. The inner planets all are made of rocks and
minerals, but the characteristics of the
Like all inner planets, Mercury has a core made of planets are different. Earth is the only
iron and nickel. planet with water.

Mass : 330,104,000,000,000 billion kg
(0.055 x Earth)

Equatorial Diameter: 4,878 km
Polar Diameter: 4,879 km
Equatorial Circumference: 15,329 km

70 kg : Your weight in Mercury is 26.4 kg

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