Re: The Dark Side Of The Moon
Starlord,
The link Didn't work - I think due to some problem with my internet explorer - the c*** keeps crashing on me, and I can't make it work :angry: !!!
But I think I can guess your point: Titan and our moon have similar properties regarding size and mass, yes? But titan has a hell of an atmosphere... ummm I think something like 2 times
denser than earths - despite the low gravity?
True. But remember that
temperature has a lot to say as well! If the moon and titan were switched, Titan would soon (in a few milleniae) loose its atmosphere and - with time - the moon would gain one. Lower temp means slower movement of gas-particles at the surface. If particles are slowed to a speed lower than the escape-velocity of that particular planet, its atmosphere will stay. Given time it may even grow. If temp rises to a point corresponding with particle movement faster than escape-velocity the atmosphere puffs away.
Point is the moon and Titan have a difference in day-time surface temperature around 300 degrees C. !!!
Take a second glance at this link. Explains the whole thing.
http://zebu.uoregon.edu/~soper/Moon/atmosphere.html
Its that heat/light radiation and solar wind that does it. Ever notice how all gas giants are out in the dark cold regions of the system? Originally - before the sun became a reactor - this huge amount of gas was more evenly distributed. The earth and moon might have had a
really heavy atmospheres back then, but I dont know - mere speculation.
But once the sun started radiating of light, heat and high-speed particles ("solar wind"), this gas was pushed outwards, where it settled as huuuge "atmospheres" around existing planets. Some scientists believe that jupiter and saturn have dense rock/metal cores roughly the size of earth, and that these cores are the "original" planets, that have since been drowned in an atmosphere 1000s of times heavier than the planet itself.
Here is a question for you to consider, what if, oh, let's say about 75,000 years ago,
hundreds of very large explosions basicly incinerated the surface of the moon along with what ever existed as an atmosphere, how close to what is present today would it be?
What are you suggesting? Volcanoes? Nukes?
H.H.