I've wondered if they had something to do with either deflecting, or minimizing CME's effects...or God forbid, aggravating conditions to induce CME's or other problems by tinkering with the suns energy.
As you know, there have been many predictions of an intense upcoming solar event in the next couple of years, the Mayans and many other ancient cultures went to great lengths to warn us about the 2012 time period. How did they know this? Could these sphere's be connected with a dark technological civilization that returns every so often to wreak havoc in the solar system.
I would like to think they were sent here to minimize solar events...
Another possibility is that the sun is some kind of stargate, there has been a lot of activity around the sun the last year or so...the winged object and other large objects that have appeared in the region around the sun.
I just listened to a remote viewer Maj Ed Dames who worked for the military, on Coast to Coast who was very serious about the upcoming "kill shot" from the sun that will hit sometime towards the end of 2012, or beginning of 2013. That the earth was going to suffer through a very rough time when the solar and x-ray radiation cause much damage to all life forms. He said the sun will exhibit such outrageously bizarre behavior that the wars will end, soldiers will lay their guns down en masse and go home.
At that point everyone will waken to the fact that something is very wrong...very interesting interview, apparently this guys gotten it right many times in the past. http://www.learnrv.com/
If this is true then it doesn't sound as though the sphere's are there with our best interest in mind.
Or, maybe they're some sort of space life form...