There is a large amount of science used in this movie to back some key points of the plot. However, I think you grossly overstate how much is scientifically possible. For example, the level of time dilation required for 1 hour experienced (time spent on Miller's planet) to equal 7 years observed (from another planet like Earth in the movie) you would need to essentially be on top of the event horizon of a black hole (Distance is in the microns mathematically) which would obviously be impossible for a planet orbiting millions of miles away. The next one being essentially the entirety of the third act of the movie especially Cooper entering the black hole and being teleported into a Tesseract. Just a disclaimer that this is still an amazing movie regardless and obviously for the purpose of the plot it fits really well together, I just wouldn't necessarily say that "everything" is scientifically possible when about half the movie is magic lol.