9 replies to this topic

[Oh My It's Sky]

OK, we all know Mars is further from the sun than Venus, we are told that Mars may have lost it's atmosphere due to it having no[or very little] magnetic field due to the effects of the solar wind. If this is all true and Venus also has a very weak Magnetic field [about 0.0015% of the earth's??] then why does Venus have an atmosphere almost 100 times as dense as ours instead of it being blown away?. Any thoughts?

[Godless-Liberal]

Isn't planet density also a large factor?  I would imagine that Venus is more dense than Mars.  I am trying to remember from science class, which I had 18 years ago!

[Robulosity]

Theorists state that mars was devolping into a viable planet, how ever two things most likley stopped this by breaking gravitational equalibriam.

The destruction of the planet that was between where mars is now and jupiter resulting in the astroid belt. And the fact earth kinda sorta being the pushy bitch she is forced mars about 120,000 KM further away from the sun then it currently is as its gravity increased.


Due to the now cooler enviroment that mars was sporting, and its offset gravity being thrown between the astroid belt and the big fat ass jupiter, solar winds in those area's are much higher then they are in the inner solar system

[Sexual Harassment Panda]

simple answer....

magic!

[Robulosity]

As far as the venus part goes.

Venus has a lot denser core, giving it a much higher gravitational pull (inward) then say Mar's has

Due to the planet being mainly volcanic it constantly adds to to heat which makes it a very unpleasant place but anywhoo (its also mainly caused by the fact heat from the sun is unable to escape)

I think last estimate was that Venus's core weighs as much as ours does despite being 1/4 the size

[We Could Be Heroes]

Also i read that the surface of mars has many long dormant volcanoes which includes one huge one, continent sized, while these volcanoes were active Mars used up it's store of inner core heat, turning it into a dead planet.l

[Nick]

Oh My It's Sky, on Oct 12 2006, 11:26 PM, said:

OK, we all know Mars is further from the sun than Venus, we are told that Mars may have lost it's atmosphere due to it having no[or very little] magnetic field due to the effects of the solar wind. If this is all true and Venus also has a very weak Magnetic field [about 0.0015% of the earth's??] then why does Venus have an atmosphere almost 100 times as dense as ours instead of it being blown away?. Any thoughts?

I have no idea.  Sorry

[Stupendous Man]

*hands Nick a science text*

Here, educate yourself then

Please don't spam

[Geo]

Well take a peak at

Wikipedia

[Geo]

NASA

Oh and the NASA web site :-)