QUOTE(aaron81 @ Oct 14 2006, 01:23 AM) [snapback]1389147[/snapback]
When I first saw the spheres, I immediately thought of the panspermia theory.
Although panspermia is a possible theory for the origin of life on earth it has yet to be proven conclusively. Although this exhange of living DNA in the form of dormant microbes may possibly occur between planets of the same star system it is unlikely that life would be able to survive the millions if not billions of years for a meteor or comet to traverse intergalactic distances and then reach a suitable planet.
If life is actually taken from one star system to another, the odds are that it would have to be done with intelligent design, ie:
seeding a planet on purpose with microbes and DNA sequences that can develop from there on. If the idea is to terraform a planet that is where one would start. Later one could introduce gradually more complicated or evolved forms of life to speed up the process.
There is also the possibility that in the case of purposefully seeding other worlds with a common denominator of life (carbon based lifeforms) that one would get similar results on different worlds given similar conditions for evolution to take its course.

hehehe, ever wonder why most alien encounters have aliens with humanoid features?
As for the metallic spheres, they would be an example of what I would use to start the dissemination of the 1st basic lifeforms that would sart the life process on this planet. Drop them by the thousands from orbit into a sea or lake that has the correct chemical ingredients for life to take hold and develop.
To this day even with all the speculation and experiments, no one knows how the 1st inorganic, chemical soup tranformed into the 1st single celled organism. Maybe it had a little help!