One of my best childhood memories must be from when I spent the summer when I was 12, playing a computer game named Homeworld. In homeworld, a race named the Kushan develop warp drives, unknowingly violating a 4000 year old treaty forbidding them from doing so. After warping back from the first space jump test, they find that their homeworld has been nuked by a foreign alien race. with only 600.000 survivors, they begin a yourney through the universe in search of a new planet to settle. I was fascinated by this story, which was unlike anything else I had ever seen at the time. Now I am writing my own space opera in which the humans are forced to abandon their planet as all remaining resources are spent, and having to fight off other space faring races along the way. My worry is that whoever read my story will think too much is borrowed from Homeworld, or the more known Battlestar Galactica. Do you think a story like this is perfectly acceptable to write? Most of my story is very different from both, but the premise is basically the same.