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Inner Planets 21.2

9-5-2014 21.2 Inner Planets


What are terrestrial Planets?

Planets who are very dense and have a rocky surface.


They are the first four planets in our solar system.


1st Planet

Mercury – has 38% of Earth’s mass;


Rotation (Earth’s day) = 58 days 19 hours,


Year = 88 Earth days long;


Distance from the Sun = 3.2 light min.


Atmosphere- -175 C at night; 427 C during the day


2nd Planet

Venus- is known as Earth’s twin, slightly smaller.


Rotation = Retrograde – a clockwise (backwards) spin of a planet.


Rotation- 243 days and 16 hours;


Year = 224 days and 17 hours


Distance from the sun = 6.0 light minutes


Atmosphere = the hottest planet 460C due to the greenhouse effect.


Greenhouse effect= carbon dioxide gas traps heat and makes the planet very


hot. Sulfuric Acid makes the atmosphere yellow. These two gases are


Deadly to any living organism.


3rd Planet

Earth – the only planet which supports life, the only planet that has water.


Rotation = 23 hours and 56 minutes


Distance from the sun = 8.3 minutes


Atmosphere =78% nitrogen, 21% oxygen, 1% carbon dioxide and


other gases.


Year = 365 days and 6 hours


4th Planet

Mars – is known as the red planet due to red dust


Rotation = 24 hours 40 minutes


Distance from the sun = 12.7 light minutes


Atmospheric Temp range from -13C to -77C; any water is in ice form


Largest Volcano in the Solar System is found on Mars = Olympus Mons.


Summary (Write summary in three or four sentences at the end of all notes pages on the topic)


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