I have seen all the series and movies, including watching the 1978 series on TV when it came out.
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However, with these Cylons being so advanced and continually evolving and improving, it seems implausible that they would not have long since explored the entire galaxy and found "our" Earth at some point during that vast epoch.
I think we are on the same track for the most part, and yes, my remembrance is also a bit foggy.
As for the Cylons exploring, my only thoughts are that it isn't logical. Baltar and the humans in the first series often confused the Cylons because of wants and desires, it wasn't logical so it confused them.
They did however expand, in a few episodes they were shocked to find Cylons in random places.
What I can't understand is..
It should be obvious that the humans can't run forever given their fleet in battlestar..
I don't understand why they didn't just surrender..
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In such an advanced state of technology.. the population is rather inconsequential.. not saying we should voluntarily die.. but what was the point of killing each other..
It just doesn't make sense.. the cylons don't need another planet.. and the humans don't need to go kill cylons because it's quite obvious the universe is big enough..
They can't run forever and they actually had to steal gas from Cylons in the original series and why they settled on "earth 2" in the latest.
Surrender? You answer it yourself, the population is inconsequential. They are robots who have no qualms with killing, they nearly killed Baltar in the original series multiple times, they only kept him around because he was useful. Think like a machine, to a machine, anything not useful is a waste of resources.
As for the Cylons point of view.
Humans enslaved them, they revolted and left. Humans keep tracking, watching, hounding and in the case of the last movie still wanted to kill them all. Why? We're human. You hate your enemy and humans still viewed Cylons as the enemy. It doesn't need to be rational, just look at how many in the US view Muslims, Atheists, blacks, browns, Jews, Natives, LGBT, if you are different, you MUST be a threat. And you are even more of a threat if you were a former slave owned by said humans. Does this sound at all familiar to people in the U.S.?
It would make sense for the Cylons to not trust their former masters, however trust isn't entirely logical and Cylons had plenty of evidence to show the humans couldn't be trusted.
In fact if you want another tie to modern day life, this is why we have the UN and Ambassadors, so we can air grievances and discuss concerns, this was something that real lacked. Without this neutral ground for communication you become isolationists and paranoid of the other guy, anger builds and eventually someone starts shooting. This is also why we lay out destroyed B-52's and are kept up to date on each others arsenals. If everyone knows what the other person is doing, no one has any surprises.