((Up to you, but not over 40 and there should be lighter ships too instead of an all-out heavy cruiser fleet. And the 40 doesn't count fighters))
"Our posturings, our imagined self-importance,
the delusion that we have some privileged position in the universe,
are challenged by this point of pale light.
Our planet is a lonely speck in the great enveloping cosmic dark.
In our obscurity – in all this vastness – there is no hint that help will come from elsewhere to save us from ourselves."
- Carl Sagan