Q about Government

So there are all these posts lurking around the government and I thought I would pose a question and ask the people on here there thoughts. I looked over the post about socialism and a few others on this forum. It seems that many of us have different views about the meaning behind government or their motives but I want to see what you guys thought about government in the future.
It seems that government, like business, always has 1 goal in mind. To expand and grow larger. In basic Economics they teach that any business either mom and pop or the larger seeks to build itself into a monopoly. This aspect ripples into many sectors of our lives including the government.
Carl Segan, along with many other brilliant minds concur that humans, in order to survive, must get off this planet and move to a two planetary system. I agree that putting all your eggs in 1 basket is illogical. This runs deeper then global warfare or anything else we can do to harm each other. After war there will be survivors, human, plant, or animal. But if a global even were to happen (a cosmic one or the like) we would need a new home.
So now were talking 2 planets with humans. This is unknown territory with human government. Now theoretically expand this thought to include a multi state human planetary system with hundreds of planets. Would we need to unify government first before going further to a multi human planetary system?
I am pretty fluent with the theory of the zionist and unified government and think that as a human, we have a lot of bounds with each other and our governments to face, but is government not like everything else in the fact that is must grow bigger and more unified?
This is something that in the near future we might have to face. Recent and exponential advancements with technology have proven that manipulating time and space is evident. It is also logical to think that other, intelligent or organic life can exist and that the universe it not only super massive (No words can justify that) but that multi ones might exist within or around it.
Thoughts?

I don't think that any one form of government would be able to mantain control over a milti-planey society. That's not to say that any and every form of government wouldn't try they would just all fail.
There are plenty of people just within America that would say something along the lines of: "How can those fat cats in washington tell me how to run my business here in the great state of 'X'?" Now take that idea and expand it to a milti-planet sysem of colonies and civilaizations. How could a governmental body mantain control over an outpost on one of jupiter's moons?
I think that as man moves into the stars each new civilazation will evolve its own brand of government, even if that mean having basically no government.

We're fortunate(or unfortunate) enough to be alive in one of the most critical periods of human history. If things generally go right in the next 50-60 years, we won't have to worry much about us killing.... us, and focus on our lives that happen to live on the knife edge of the universe, and make the struggle for surviving in such a universe. The earth won't last forever, after all. However...

Billions of us believe that the creator of the universe wrote some books which dictate the way we should live our lives. These books make claims that are just not compatible. This is illustrated in the Israeli/Palestinian conflict, among other religious skirmishes on our planet. But they are just that, skirmishes. If there's a great war in the 21st century, it will be a religious war. Consider that billions of people support martyrdom in defense of Islam. Consider that our technology advances exponentially, this will not stop. The ability for a single one of us, or a small group of us, to remove the rest from this planet, also becomes available exponentially. The one danger here is belief without evidence. The belief that it will rain, regardless of how this belief reflects reality, puts an umbrella in our hands. At worst we are inconvenienced ever so mildly if this belief doesn't reflect reality. Unfortunately, this was putting it mildly. We cannot have a cold war with a large portion of the world, a world which is angry at us, because they are confident that they have it right, we have it wrong, and they are willing to die to prove it. "You've got to die some day." - A high ranking military official in Pakistan, commenting on nuclear war.