Chris Nolan's Interstellar is chillingly beautiful ( but not as inter-dimensionally twisted like his other movies). The movie ending is understandably straight forward but its the 'science bit' that leaves you annoyed.
So, for those of you who didn't get it...
Artist Dogan Can Gundogdu has created this chart, explaining the movie’s complicated timeline.
"I’m very aware of the plot holes in my films and very aware of when people spot them, but they generally don’t." -Nolan
Alrit, so that means this piece of info-graphic could merely be an assumption or just a brief summary of the movie.