On a local scale, people associate weather with winds, rains, hot or cold days etc. Effects readily discernable. Weather as I understand it relating to space would be solar wind, radiation. I don't know and I don't know if the scientific community actually has any theories on galactic weather.<br /><br />At this point, galactic weather as it relates to earthly global warming would be very difficult to prove or even come up with a cohesive theory for without better data. As you mentioned, Voyager II is the next step towards that end.<br /><br />My own thoughts and thats all they are, tend to suggest to me that galactic weather may play a role but solar weather and earths own weather largely overwhelm galactic weather. But thats something that better research would have to prove. If there is a galactic weather system if you will, the speeds at which events occur are likely to be on a galactic scale...sloooooow. The galaxy is comprised of stars, a black hole at the center seems to be at the heart of most galaxies. between the stars and gasses and planets is an awful lot of empty space or as recent studies suggest, dark matter. It would seem that any weather is confined to localities such as the star systems etc. And that the only way we might encounter such weather systems is by passing close to an interstellar system. The gravitational problems alone that would result from such an encounter would produce effects we could document if the passage is close enough and if any closer, we might not survive.<br /><br />As for earthly global warming. I think the evidence for it is there. But the evidence is not strong enough to conclude its resulting solely from human activity. Something as benign relatively speaking, as a slight change in the suns energy output could increase global temperatures that correspond to a miniscule energy output. Global warming may be a natural cycle that would be connected largely to solar activity and its effects on earths weather due to what the sun d <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>