Definitive answers to the questions, “What year does the film Interstellar take place, and when did Cooper and Endurance leave earth?”
The filmmakers most likely didn’t intend for the timeline to be deconstructed like this, but they should know better :)
Update: I’ve included other clues and information from Kip Thorne’s book The Science of Interstellar, and the official novelization of the film. There are however, some weird contradictions between the novelization and the film.
I’ve only found one specific date in all the official or semi-official literature available and that is the year 2019. Kip Thorne says this was when Professor Brand discovered the wormhole. Its not in the official script, but Thorne did write the initial treatment so its as good as any data we have.
The Interstellar Timeline
2000 – Donald is born
Donald states he was a kid when there were 6 billion people on earth. The last year this was possible was 2011. Being a “kid” to an older man normally means somewhere in the age of 5-18. So theoretically Donald could have been born anywhere from 1993-2006. This also matches up with his statement about “new gadgets coming out all the time.”
The Yankees (who are featured in the film) won the World Series in 2000 and it sounds like a great round number to start from.
Note that this date is not critical to figuring out the timeline, its just a fun throw in.
2017 – Gravitational anomalies are detected
In the conference room in 2067 it is stated that NASA detected these anomalies almost 50 years ago.
Kip Thorne also says in his book that Professor Brand went back through the data two years before the wormhole discovery and found other gravitational anomalies.
2019 – The wormhole appears
In Kip Thorne’s book The Science of Interstellar he imagines that Professor Brand and LIGO discover the wormhole in 2019. While not an “official” source, Kip did write the initial treatment of the script and this is the only specific date I’ve found in any related source. So this year is the best we have to go with and will be the year on which all other data is based.
In the conference room in 2067 it is stated that NASA saw the wormhole 48 years ago.
2025 – Erin is born
According to Google, the average age for someone to have their first child in the US is 25. So we’ll say that Donald had his daughter in the year 2025. The novelization says her name is Erin. It also tells us that she was an only child.
2031 – Coop is born
The novel and the film seem to indicate that Coop is in his 40’s when he leaves earth like when Donald tells him he was born 40 yrs too early or 40 yrs too late, or when the novel suggests that at the age of 124, 80 odd years had passed since Coop left earth.
This age range also matches up with an article where Christopher Nolan and Matthew McConaughey “talked about who we are as 43-year-old men, talked about who we are as [fathers], talked about our kids.” Their protagonist would seem to be in the age range of 40-45.
But it just isn’t mathematically possible given the facts we know about Murph’s age at the beginning, Murph and Cooper’s age being the same in the middle and Cooper’s age at the end. Coop has to be at most 36 years old when Endurance launches.
So for now, I’m ignoring the indications and going with the “facts.”
2052 – Tom is born
If we keep to about the same average of the first child being born, and assume Tom was their first child, while also factoring in Kip Thorne’s date about the wormhole discovery, Donald’s daughter Erin, had Tom in the year 2052.
2057 – Murph is born and the Lazarus missions launch
We know Tom is five years older than Murph so If we calculate that Tom was born in 2052 Murph will be born in 2057.
The Lazarus missions were sent out 10 years before Coop and endurance leave earth, according to Dr. Brand’s explanation.
Its also fitting that the year the missions launch to save earth, the earth’s eventual savior is born.
2067, April 18th – The Endurance leaves Earth
We know Tom was 15 when Cooper left earth so we just add 15 years to Tom’s birth. We can also calculate this date by adding 48 years to the date of the wormhole discovery.
And if you want to get really specific…in the film an older man from the future documentary states that the huge dust storm at the baseball game happened on April 15. Coop and Murph find NASA the next night on April 16 and then spend the night there into the 17th. Coop and Donald talk that evening on the porch and then the next morning Coop leaves.
The novelization says this differently and has it occurring on May 14th. Apparently it wasn’t “clear as a bell…”
2069 – Endurance reaches Saturn/Wormhole in February
8 months to Mars, 14 months to Saturn
2069 – Endurance reaches Miller’s planet
After being on Miller’s planet Brand says she hasn’t seen Edmunds in a decade. Assuming she isn’t counting the two years she spent in cryo-sleep we can infer that it took less than a year to get to Miller’s planet. Additionally, after they come out of the wormhole the crew remarks that they are coming up on Miller’s planet fast. So I’m guessing maybe it took them only several months (if that) to get there.
Kip Thorne also confirms this by telling us that the crew entered into the galaxy very near to Gargantua.
2092 – Coop and Brand come back from Miller’s planet.
They spent a total of 3 hours and 20 minutes on Miller’s planet while 23 years 4 months pass on earth.
The movie doesn’t seem to indicate this as Case says it will take 45 to an hour to drain the engines. The pacing of the film also suggests they don’t spend that much time down there (and I know, that’s kinda the point), but in order to have 23 years 4 months pass on earth (using the ratio of 1 hour on Miller’s planet equaling 7 years on earth) they have to have spent 3.3 hours on Miller’s planet. Maybe they bounced around on the wave longer, or after the engines were sparked they had to come down again. The novelization seems to confirm that they did ride the wave for awhile.
Murph is now 35/36 years old. She was 10 when Coop left. Two years to Saturn, maybe several months to Miller’s planet and 23 years 4 months later.
In her birthday message she says she is the same age now as when her father left. According to my timeline that would put Coop’s birthday in 2031.
Again the film and novel suggest both are in their 40’s (the novel specifically says when Coop is 124 that 80 odd years have passed since he left earth) but unless there’s something I’m missing, this isn’t possible given the facts surrounding Murph’s age.
The film is also very careful to specifically state that Murph was upset because they were the same age and it was her birthday. There is a lot of detail there so it makes it hard to fudge and say they were in their 40’s.
2093 – Endurance reaches Mann’s planet
There has to be at least several months travel. Right before they were coming up on Miller’s planet Doyle tells the group it is months to Mann’s and Edmunds is even further. The way Doyle says it indicates that its more than a few so probably 6-9 which would probably take them into another calendar year.
Kip Thorne also confirms this.
2093-2100 – Endurance leaves Mann’s planet
This is where things get tricky. We are told at the end of the film and novel that Coop is 124. Specifically 51 of that is spent in time slippage in Gargantua. In order for the math to work at the end with Coop being 124, and pushing 120 after the slingshot, and still being the same age as Murph when he left, we have to account for some missing time.
We’re missing about 7 years. There is some outside evidence for this passage of time on earth. Tom and Lois apparently have another son in this time that appears to be 6-10 years old. The novel confirms that he is six years old though I think in the film he looks more like ten. Also Dr. Brand (Michael Caine) ages and dies.
The timeline and relative events are also pretty concrete up to this point. There really isn’t any wiggle room to add in years before based on the facts we know.
We can says with a fair amount of certainty that it can’t be time slippage on Mann’s planet because the novel says specifically that Mann’s planet is outside the time slippage zone and in the film Endurance was able to be pretty close to Miller’s planet , right on the cusp of where time dilation occurs, and not be affected.
Kip Thorne estimates they were on Mann’s planet only 40 days. He says this because when Cooper rescues the Endurance they are very close to Gargantua. Thorne says this possible if Mann’s plant has an egg shaped orbit that brings the trajectory of the planet close to Gargantua.
So, I’m not sure what to make of this. To make the years work with what we know at the end of the film it seems that we’re missing 7 or so years. Maybe they spent an extra hour on Miller’s planet and didn’t realize it…
Jonathan Nolan, if you ever read this please contact me and let me know :)
2151 – Endurance slingshots around Gargantua
Coop remarks “This maneuver is going to cost us 51 years.” Amelia also remarks that Cooper looks pretty good for pushing 120. This matches up with the birthdate of 2031 for Cooper (give or take a few months).
2156 – Coop wakes up on Cooper Station at the age of 124
Coop is no “spring chicken” and has spent five additional earth years somewhere. Its most likely not in the Tesseract as that is in the bulk – outside of space and time. Our options appear to be:
- He encountered more time slippage
- There is actual time in the Tesseract and that was used to transmit the morse quantum data
- He was in a coma after reaching Cooper Station.
I like the idea of more time slippage. Commenter Minna Aalto pointed out that there most likely would have been additional time slippage as Cooper passed the event horizon.
Murph now would be 99/100 years old. This would make sense if she and Getty get together and start a family. She tells us she has grandkids and there are some middle aged looking people in that hospital room said to be family. According to our earlier conclusions those generations would span 50-70 years. Add that to her late 30’s when she solves the equation and it is plausible.
2157 – Coop reaches Brand on Edmunds planet and they live happily ever after.
Okay, I added that one in. But like most Nolan films he makes you think up your own ending.
I would love to hear other theories and please correct my math/facts.
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I was confused by their ages also – I mean, like you said, given the FACTS Cooper cannot be older than 35/36, yet the movie makers speak about him as a middle-aged man. Well, the actor is, but the character cannot be. And I never saw Chastain as a "woman in her middle-age", I definitely think she looked like 30-something.
I think you have done an incredible job on this, very accurate, but few things I have thought on my own: I’m not sure if the trip to Mann’s planet takes as long as 6-9 months, because the actual trip only takes 40 days; all the other days/months are spent finding a suitable IMBH. (page 258, Science of Interstellar) I understood that this could take a couple of months, but not 5-8 months. Of course, we don’t know so either one of us could be right! :)
And then, the time slippage at the end. Mann’s planet didn’t have any time slippage, most of the time it was very far away from Gargantua and being close to Gargantua at the end doesn’t essentially mean that time will run slower – the Endurance was parked very near Miller’s and didn’t experience any time slippage at all. The way I understood it, the slingshot-maneuver they were doing before Cooper detached, cost them 51 years, like Coop said. The additional 13 years that Cooper lost, were lost during that time when he detached and was pulled towards Gargantua’s singularity. When closing on a black hole, he experienced even more extreme time dilation and 13 years could have easily passed in minutes or seconds…I mean, he went through event horizon! And that adds nicely: 35+2+23+51+13=124.
The tesseract was out of time as I understood it, so no time at all was spent there.
(btw, we don’t actually know how much Brand experienced time slippage, but it cannot be anymore than 13 years that Cooper experienced – if time moved slower for Brand, Cooper would reach Edmund’s before she did! Or that’s how I understood it, but I hope that I’m corrected if that’s not the case…personally I think that they are pretty much on same sync, like coupl of months or years off, at most. Brand experiences some time slippage herself while orbiting Gargantua before taking off to Edmund’s.)
But yeah, those were my five cents….:)
Yeah, I agree that time slippage on Mann’s planet is a no-go but I still don’t know where those missing years went.
I like your theory of additional Cooper time slippage as he went into the black hole. That makes more sense.
I think you’re right about the Tesseract being out of time too as it is in the "bulk." I’m curious about the oxygen however as it would have taken him a long "time" to import the quantum data as morse.
I don’t think Brand experience any additional time slippage as the 51 year slingshot was to get her out of the gravitational well.
The only issue I see with the 13 years is that Amelia says Coop looks good for pushing 120 – this is after the 51 and before the 124. So just adding 13 while he goes further into the black hole doesn’t work. We could add 4/5 for additional time slippage but not the full 13.
English is a foreign language for me so I don’t always understand the subtle meanings in the text, but the "pushing 120" left me also wondering…I understood that Brand meant that Cooper is 110-something years old, pushing towards 120 years. He was at that time 111 so it’s possible she meant it that way. I figured that in that chaotic moment Brand didn’t have time to make accurate calculations in her head, so she just said that as a humorous relief, without thinking if he was actually 111, 115 or 119 years old.
The slingshot in the end was to get them out of the gravitational well, yes, but I still think there is a possibility to be outside of that well and in the time-dilation zone; like Miller’s planet. It has also balanced orbit around Gargantua, not getting sucked into, but being still extremely close. I base this deduction on these pictures from the book: http://imgur.com/HQGoV63 (Miller on the left, Endurance at the end on the right)
It looks like Endurance’s critical orbit is almost as close to the event horizon as Miller’s orbit; a little bit further but still within the time-dilation zone, only experiencing less time dilation than Miller’s. ( the graphs at the bottom) Of course there is no accurate graph for the slowing of time in these, so the accurate amount of time dilation is just one big question mark…
You’re absolutely right about the oxygen, never thought of that before! Maybe that is where the movie also steps into scifi-realm, along with the tesseract and the fact that cryosleep retards your aging…a lot. Mann sure looks fresh for someone who has been on a planet for over 30 years!
I used my son’s birth year, 2002, for Don and came up with the same timeline range as you did. I agree that As Coop descended into the black hole, he experienced additional time dilation to get him to 124 years old or thereabouts. I do wonder how he (and TARS) got from Gargantua back to the wormhole, where he shook Brand’s hand and popped out on the Saturn side to be snapped up by the space station Rangers. Another feat by the super future 5th dimension humans?
Really interesting article.
I also was wondering in which year Interstellar’s story starts and 2067 year seems kinda believable according to your calculations and Kip Thorne’s book.
Thank you!
I’m probably outing myself for how simply my mind works, but have any of you wondered, too, about how Nolan approached the conundrum of the automobiles featured in the movie? Just to name a few, the Dodge Ram of Coop, and the Jeep Wrangler of Murph. Both were, in 2014 terms, considered late-model. That would mean the Ram was at least 50 years old when Coop left earth, and the Jeep was like 80 years old when Murph and Getty were driving around in it!
Yep, good observation. Maybe since the priority was food they just didn’t change the design anymore and they aren’t actually that old but just look it?
I think it could make sense that they are driving around in a 50 year old car. If you think of cliche farmers today I’ve seen some in the midwest driving pickup trucks from 1960’s and 70’s. And since cars today are made better then they were in the 60’s/70’s then it is possible that with regular maintenance a vehicle from the 2010’s could stay running for that long.
Coop was very mechanically inclined so to him a car from our time would be like an old school car that he tinkered with and kept running as a hobby. Just like people do today with old muscle cars.
Fantastic, I like the way you broke everything down and shown such great attention to detail! Answered many queries I had about this movie, its thought provoking enough without having a clearly defined timeline contained within the narrative of the film.
That’s really cool – glad it helped out!
Nice explanation!
Also, have you thought about why the hunger began in the first place? I think that its because fossil fuels destroyed the ozone layer, which traps light and heat. This allows more sunlight to enter, which means water will evaporate. You can see this when he captures the Indian drone, and you can see the reservoir. I don’t think a reservoir that small would be sufficient for all that farmland. You can also see that the water has evaporated from the reservoir, and as a result there is a lot of sand visible.
If you think about it, this is similar to how the dust bowl started. The soil became dry, and the wind came and started dust storms. Then, after nutrients in the soil were gone, farming became less efficient, and different plants started to die. As a result, more farming was needed, and the story for Interstellar begins.
@ Rahul Katre: The ozone layer does NOT trap light and heat. It shields the Earth from ultraviolet rays. The Earth’s atmosphere as a whole traps heat dues to the carbon dioxide in it.
So yes it is plausible that a runaway greenhouse effect occurred due to the use of fossil fuels (Al Gore would be smiling in his grave saying "I told you so") however neither the atmosphere nor the ozone layer have any effect of how much light can and can not get through. That would be a result of clouds or some molecules that would cause the sky to go opaque.
Take away the incorrect facts about the ozone and light and the rest of your theory could be possible.
Also after some research and re-watching the movie (before I left that last reply) I realized that the food epidemic is explained: A micro-organism called "Blight" which breathes Nitrogen (which about 80% of our atmosphere is) was thriving. It was slowly killing all of our crops and corn, which was more resistant, was now starting to succumb. As the crops and plants die they no longer are around to hold the soil together. This makes the dirt become loose and thus it gets kicked up by the wind in the form of dust storms which cause more damage. By the time mankind realized this problem most of the damage had been done.
About 30 minutes into the film when they first discover NASA Michael Caine’s character (Coop’s former college professor) briefly explains this.
I’m a late contributor to this blog, which I only discovered today. My bad, because – as a huge fan of Interstellar – I have been trying for such a longtime to make sense of the timeline of the story, without much success. I tried to reconcile all the datapoints provided in the movie and I always ended up with a hole of 7-8 years; I found many other explanation on the internet that were just making up the numbers (many of them counted 58 years for the time slippage around Gargantua, but that is clearly wrong as that is spelled out clearly as 51 years in the movie).
During the powersling around Gargantua, Brand tells Cooper "….you are pushing 120", while adding up all the numbers provided until that moment, Cooper should be 112 – or maximum 113. This is unmistakable, and this leaves the famous 7 or 8 years unexplained to me.
And finally today I found this very nice blog, with a pretty neat explanation of the timeline, thank god without any fancy diagram, which very candidly admits this issue of the 7 years unexplained….alleluja!
Now, just one additional thought on the timeline: there is another time slippage which is not accounted for in the movie (nor any quantification is provided), and that is the time Cooper spends going through Gargantua, after he left the Endurance, and Brand on it. That should be a rather big time slippage as he travels through a black hole, towards its singularity. In any case, this would be of no help to explain the 7 years, first because this happens after the gap surfaces (during the Gargantua powersling) and also because this time slippage would be much bigger.
Anyway, this won’t prevent me to keep watching this fantastic, epic movie 2/3 times a years as I’ve been doing since it’s come out!