mercury venus mars
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Venus Mercury and MarsTRANSCRIPT
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What creates a planetary magnetic field?
1. Metallic material in the core
2. (a) Fluid Motion of the core
OR
(b) Rapidly Rotating planet
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What benefit is a magnetic field?- Protects the planet from atmosphere stripping solar winds.
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Mercury-Roman god of Travel
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Mercury - Basic InformationNo Atmosphere
Very Weak Magnetic Field (1% of Earth’s)
Rotates 3 times for every 2 revolutions
Temperature variations: Shadow: -300F Sunlight: 800F
Highly Elliptical Orbit 29 million miles to 43 million miles
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Mercury TransitThe planet passes in front of the Sun.
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ME-S-S-EN-GE-RMercury Surface Space Environment Geochemistry and Ranging
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Water Ice -Found in Permanent Shadows of craters.
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VenusRoman god of Love
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Venus - Basic Information
Revolves once every 243 Earth Days
Rotates once every 224 Earth Days
Thick CO2 atmosphere (100 times thicker than Earth’s)
Surface Temperature = 900F
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Venus - Basic Information
Runaway Greenhouse Effect
No moons
No magnetic field
No plate tectonics
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Venera SpacecraftRussian - First landing on another planet.
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MarsRoman god of War
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MarsHalf the size of the Earth
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Mars - basic info
Atmosphere 1% as thick as Earth
Mostly CO2
Temperatures can range from
-200 F up to 70 F
No magnetic field
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Mars Exploration-1970’s: Viking Landers -1980’s: Numerous failed missions -1996: Pathfinder Rover -2004: Mars Exploration Rovers (Spirit & Opportunity) -2008: Mars Phoenix Lander -2012: Mars Science Laboratory (Curiosity)
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Anatomy of a Mars LandingCompare three different approaches
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Water in Mars’ past?
CONFIRMED
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MarsSubsurface salty water may still exist on Mars
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Mars’ Methane Enigma
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Mars has 2 small moons: