Unravelling the Interstellar mystery

 I decided to analyse and debunk a few theories about the Interstellar's concept of Interstellar travel and everything else that confused the audience. The audience might have enjoyed the acting, cinematography and the background score. But many of them were scratching their heads at the end when it came to the story.

Warning:  This article contains spoilers, lots of them.

1. NASA's Plans:  Brand had sent explorers to find habitable planets through a wormhole near Saturn which appeared about 40 years ago. He considered that mysterious supernatural beings referred to as 'They' caused the wormhole to appear so that humans can save themselves from the dying Earth.
   
   The Plan A was to mass evacuate Earth's population to the new planet through the wormhole, if it is found by Cooper and team before Earth becomes inhabitable. Also, Brand has to solve a gravitational equation which will enable humans to perceive everything in 5 dimensions according to Kip Thorne's law (which states that there are at least 2 more dimensions along with X, Y, Z).
   
   If Cooper fails to find a new planet in time and Brand fails to solve the equation even if a planet is found, Plan B was to develop a colony of humans in the new planet using the human embryos Brand gave to Cooper. Cooper and team must not come back to Earth if Plan A fails and forget about Earth's population and leave them to die.
   
   It is later revealed that Brand did not have any hopes on Plan A and had set up the idea so that people can have hopes on saving their loved ones and mankind, so that Plan B would succeed. Brand had sent Cooper to space permanently as he had solved the gravitational equation 40 years ago but it was not enough to transport humans to another planet.
   
   
           
2. Wormhole and Interstellar travel:    The wormhole was placed by 'They' so that mankind can save themselves. It's a shortcut to another galaxy and was created using the bending of space-time continuum, explained in the simplest way by Cooper's travel mate Romilly using pen and paper. As previous expeditions of NASA found out, this new galaxy had 12 planets which could sustain life but beacon's (signals sent by explorers) were still active from only 3 planets - Miller's, Mann's and Edmund's.
   
   Miller's planet: The gravity here was 130% that of Earth's hence waves as huge as mountains. Every hour spent here was equivalent to 7 years on Earth because the planet is close to Gargantua - the Black Hole and time here moves exponentially slow, in proportion to the distance from the black hole. Hence, Miller had actually arrived to the planet only hours before Cooper arrives and died as soon as she landed because of the waves. Cooper and Amelia spend around 3 hours inside the planet and find out that the planet is inhabitable. And hence after they come on board the Endurance, they find out that Romilly had spent 23 Earth hours waiting for them.
   
   Mann's planet: Cooper and team enter this planet because Mann's data was the most promising. However, they find out that Mann had been sending incorrect data so that someone could rescue him. The planet's air was unbreathable.
   
   Edmund's planet:  This was the closest to the black hole and when Cooper found out that he cannot go back to Earth after Endurance is partially destroyed by Mann, he decides to send Amelia onto the planet, while unloading TARS and himself from the ship so that there are more chances of Amelia safely reaching this planet and implementing Plan B. He sends TARS into the black hole so that it could send important data back to Earth which could help in solving Brand's unsolved equation.
3. Fifth dimension:    This is the most complex part of the script. It draws inspiration from many time-space theories and alternate reality concepts. Cooper lands into the fifth dimension, the Tesseract, after he drops from Endurance. This Tesseract, a place where space and time are infinite was placed by 'They' who are humans from the future and who have solved the mysteries of space-time-gravity, so that Cooper can fix the past. Only if he does that can the future of 'They' exist and this process is in a temporal time loop.
   
   However, time cannot be altered, as can be seen when Cooper is unsuccessful in making his daughter, Murph to prevent leaving her in the past. His attempts only cause the same events to happen which occurred in the past. He uses gravity, which can slip through time, to communicate to Murph. He used Morse code to signal her to stay, and drop sand to reveal the co-ordinates of NASA. He uses the watch to send data gathered by TARS from the black hole to Murph, who eventually completes the half done gravitational equation (Plan A), advancing humanity's understanding of space-time, hence saving the world.
   
   There seems to be some small inspiration from movies like Back to the Future and Harry Potter and the Prisoner of Azkaban which had time travel and alternate reality concepts where the character confronts his past/future in another dimension, just like Cooper did.
   
   
                          
4. Ending:  Since the Tesseract was closer to the black hole, when he ejects from it and wakes up in the one of Saturn's satellite named The Cooper Station with advanced humans, he finds out that the minutes he spent inside the Tesseract were over 50 years for the rest of the humanity. He later realises through his aged daughter that Amelia is still in Edmund's planet and sets out to rescue her, and this meeting would be only after a short while between his dropping onto the Tesseract and Amelia's landing.
5. What next?: There's a high probabilty that Interstaller can have two more sequels. The next part might head in one of two directions - 1. Cooper rescues Amelia and returns to Cooper Station, where several more years would have passed by. 2. Due to some circumstances he is forced to stay with Amelia in Edmund's planet and develop the embryos and start a colony.
   
   It's now clear that there would be no involvement of aliens or supernatural beings in the franchise since both the wormhole and the fifth-dimensional Tesseract were created by future mankind, so that the past mankind could save both.
6. The poem (by Dylan Thomas):  I actually found some connection between Brand's poem and his A and B plans.
   
   "Do not go gentle into that good night,
   Old age should burn and rave at close of day;
   Rage, rage against the dying of the light.
   
   Though wise men at their end know dark is right,
   Because their words had forked no lightning they
   Rage, rage against the dying of the light.
   Do not go gentle into that good night."The first line indicates Brand's indirect caution to Cooper for the mission since only Brand knew there is no Plan A. 'Good night' refers to humanity's revival in a new world. The second line indicates the dying of Earth's population (close of day), again because Plan A is a failure. Third line refers to the time limit (rage, rage) Cooper has to find new worlds while 'dying of the light' may indicate the black hole. Fourth line may refer to Brand himself who assumed that Plan B was the only chance to prevent humanity's extinction.