Why I did not like the movie “Interstellar”

When Cristopher Nolan’s Interstellar hit the theaters in November 2014, I decided to wait for reviews from my friends. My friends, most of whom were pursuing Electrical Engineering and Physics majors, had this to say about the movie after they watched it: “Meh, too many logic holes”. So I skipped the movie; but over the year my curiosity and anticipation grew as I kept hearing positive recommendations from many others. So I picked up the movie when the DVD was released last month.

My verdict: I was disappointed. Why? Because I did not understand the movie. Don’t get me wrong; the performance by Matthew McConaughey and Michael Caine was polished, the cinematography was spectacular, and the CGI was fully convincing. But it was my incomprehension at the science presented in the movie that marred the experience. I was fully aware that the movie was a fiction, not a science documentary. But when you have experts like Kip Thorne, a theoretical physicist at Caltech, as a consultant for the movie, you are bound to expect better or easier to understand justification for the “fictitious science.”

Here are a few of the things in the movie that I could not understand

The worm hole shown as a 3D tunnel

For a brief amount of time, the movie showed the Ranger’s passage through the wormhole as going through a tunnel. Suppose we collapsed space to a 2D plane. Even if we assumed the worm hole to be a 3D tunnel between two points of the folded 2D space, the “tunnel” would become a 4D space in reality, at least according to the movie’s explanation. An instantaneous warp to the other point in the universe, and not 3D tunnel, perhaps would have been more plausible for visualizing purposes.

Visualization of the wormhole concept


Ranger requires booster rockets on Earth but not Mann’s and Miller’s planets

The spacecraft Ranger required propulsion from booster rockets to reach escape velocity when launched from Earth. However, it seems that Ranger did not require any booster rockets to leave Miller’s and Mann’s planets. The fact that the astronauts’ walk composure looked the same as they did on Earth indicated that the planets’ surface gravity is similar to that of Earth. One way to address this discrepancy is to assume that the planets were significantly smaller than Earth. Escape velocity rises with sqrt(m/r) while surface gravity rises with m/r^2, where m = mass of planet and r = radius of planet. Hence, decreasing the radius of a planet for a given mass increases surface gravity much faster than it increases the escape velocity. But then again, does planetary formation allow for such dense planets?

The Ranger spacecraft


Frozen Clouds on Mann’s planet stay afloat despite 80% Earth Gravity

Let us just ignore the first discrepancy: Dr Mann (Matt Damon) reveals to Cooper (McConaughey) that the planet does not have surface. So it is like a Jovian planet? Yet its outer atmospheric conditions are similar to a terrestrial planet? What cannot be ignored is that the solid frozen clouds on the planet are defying gravity. What is holding them up in the skies?

The frozen clouds on Mann’s planet


Time dilation within the black hole Gargantua was only a few decades

We shall simply ignore that as soon as Cooper in his ship came near to the event horizon of Gargantua, differential gravity would have elongated him into a spaghetti. What is also incomprehensible is that even after spending a few minutes inside singularity itself, less than a 100 Earth years have passed: Cooper’s daughter is still alive, probably in her 100s. Bear in mind that on Miller’s planet 1 hour equated 7 Earth years just by being close to Gargantua. Due to the inverse square law, gravitational field strength increases exponentially as one approaches the source. Not even considering singularity, just by being near the event horizon for a few seconds should have caused thousands of Earth years to have passed.

The black hole Gargantua


If you think I am mistaken in explaining the scientific holes in the movie, please feel free to correct me in the comments.




5 thoughts on “Why I did not like the movie “Interstellar”

  1. I hadn’t thought about many of these at all, especially the issue with only ~60 or so years passing between Cooper’s entering the singularity and leaving. However, as much as the lapses in logic bother some, I take them as purely entertaining scenes that forward an interesting plot. Even if the science isn’t 100% there, the fact that we’re discussing it, and that it is spurring scientific interest makes the movie as a whole beneficial for lovers of science.

    Liked by 1 person

  2. First, incredible intro picture! What a find!
    Second, there are lots of interesting things to talk about with “Interstellar” and I wish we could talk about more in class. You bring up some good points.
    Something I have to say about the event horizon and spaghetti… Just because you’re near the event horizon doesn’t mean you’ll be spaghettified – it just means that you can’t escape unless you go faster than light. A spaceship could still orbit and be fine as long as one is not near the singularity. With Gargantua, it’s supposed to be a spinning black hole too so that makes it easier for things to be nearby. I guess Kip Thorne’s book (found here) is quite a read if you’re interested 🙂


  3. Grader comments: The science of Interstellar is definitely controversial, but I’m glad is has increased public interest. Definitely check out Kip Thorne’s work–he was one of the major science contributors for Interstellar.


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