Passable but with bad science

Rating: 5/10 (23 December 2018)

This movie is enjoyable enough if you ignore the massive plot holes and bad science.
On that note, it's disappointing that many commentators and reviewers (and the "goofs" section) can't get their science right either!
50% light speed does NOT produce massive time dilation effects. A 120 year journey time on the ship would be 139 years on Earth (and that's assuming 50% LS for the entire trip and ignores the acceleration and deceleration at the start and end which would lower the Earth duration further to about 125 years). You can calculate this yourself - there are plenty of on-line calculators for time dilation effects.
A sling-shot maneuver would not work to any great extent for 50% c.. One assumes this would be for a course correction, but why bother? You can just go straight to the destination which would be a shorter and quicker path. If it's for energy transfer (a la Voyager/Pioneer spacecraft) then that too would be minute and pointless.
However, these are minor quibbles because so much other science is wrong in this movie. If you are prepared to ignore basic high-school science then the movie is enjoyable enough.