Faint Young Sun Hypothesis and Mars?

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Offline CliffordK

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Faint Young Sun Hypothesis and Mars?
« on: 16/08/2012 05:44:23 »
How would the Faint Young Sun Hypothesis have affected Mars?

Ok, so Mars is about 1.5 x the distance of the Earth from the sun.  Solar radiation decreases by the square of the distance, so Mars would get less than half the sunlight as Earth.  Multiply that by the predicted 70% of the current solar intensity and it would have been downright cold.

The equatorial regions of the planet still get warm due intense sunshine during the day and the thin atmosphere. 

However, if the intensity of the sunlight was much lower in the distant past, is it possible that Mars was once an ice ball like some of the outer moons?  It would then have gone through a phase in which the ice slowly melted or sublimed, loosing some to space, and transferring some to the poles.  How long would this melting/sublimation phase have lasted?  Thousands?  Millions?  Billions of years?


Offline Emc2

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Re: Faint Young Sun Hypothesis and Mars?
« Reply #1 on: 16/08/2012 08:32:51 »
a hypothesis says it might of happened on earth in our distant past, so I believe it could happen on Mars also.


Earth's now steamy Equator was covered with ice 716 million years ago, according to a new study.
The finding appears to add solid evidence to the theory of an ancient "snowball Earth."

it is just a theory, but it might of happened here, and if so, then on Mars is believable
« Last Edit: 16/08/2012 09:13:03 by Emc2 »
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