7) Supposing Eart h and Venus outgassed the same amount of the greenhouse gas ca

Question

7) Supposing Eart h and Venus outgassed the same amount of the greenhouse gas carbon dioxide, what stops Earth from having a runaway greenhouse like Venus? Explain in detail 8) Why does Venus shine brighter in the sky than the other planets? What scientific term is associated with this property? 9) Why is the magnetosphere important? 10) What is the possible reason there appears to be no water vapor on Venus? Explain in detail 11) What does it mean to say a planet is geologically dead? Why does this occur?

Explanation / Answer

7. The photosynthesis.

Though earth and venus outgased similar amounts of greenhouse gases, the gradual evolution of early life especially the blue-green algae allowed the fixation of huge amount of carbon dioxide and produced oxygen. This led to a shift in atmospheric compositon and halted the runaway greenhouse effect.

8. Venus is the third most brightest object in our skies after the sun and the moon.   The relative proximity to earth is one of the reson but not the only one. The biggest reason for the brightness of venus is its albedo. The albedo indicates the amount of light reflected by a surface. The venus has the albedo of 0.7 or 70% which is highest for any planet in solar system. This means that venus reflects 70% of the sunlight that strikes it.

9. The magnetosphere acts as a shield that prevents the harmful charge particles from the solar wind as well as other cosmic sources. It is crucial for the protection against the solar storms.

10. The average temperature on Venus is 461.85 °C. but, the water boils at 100 °C. Therefore, there is no trace of water on the surface of Venus which can yield vapour. However, the recent discoveries suggest slight possibility of having water vapour on the atmosphere of Venus (<0.002%).

11. A planet is said to be geologically dead when it does not contain any ongoing geological activities such as a volcano, seismic activity, tidal movements, or plate movements. It happens because the magma might have been cooled during the intial phase of the planet formation and there were no other pressures for disturbing the cold dead state.

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