Random argument man said:
Well, I guess you don't know the difference between "Science fiction" and realism. How many Science fiction movies broke the laws of physics? mmmmmm?
Besides, you're saying the movie doesn't make sense because of real scientific facts. This doesn't give a "plot hole". Plot holes are things that doesn't make sense in the story order.
Take Starwars for exemple, Princess Leia said she remembers her mother while she was very young.
However, Padmé died at childbirth. That's a plot hole.
You're right, I probably was a little too liberal with my usage of the term "plot hole."
Well glaring violations of high school-level science aside, the movie started out somewhat decently with the interplay of the characters. It's a shame that they didn't stick with that, and randomly switched over to slasher flick in the second half.
I think what counts as a plot hole in my book is why the crew member of the first ship even stayed around for those seven years: just in case someone else came by so he could sabotage them too?
The AI's selective overrides of the trajectory were a bit confusing as well.
(By the way, your example actually doesn't hold because Leia's memory is of her foster mother.)