Cooper traveled for 2 years to the wormhole and subsequently lost 23 years in gravitational time dilation on Miller's planet. When he returns to the Endurance he receives Murph's message that she is now the same age as Cooper when he departed.
Speculation. According to some sources, Cooper was born in 2032, making him roughly 35 when the Endurance launches in 2067. He is 124 on Cooper Station in the year 2156.
Cooper and Brand were on Miller's planet for 23 years, four months and eight days in Earth time - meaning they were only on Miller's Planet for roughly three hours and seventeen minutes. Listen closely to the ticks during the Miller's planet scene - they occur around every 1.5 seconds, representing one day on Earth.
Interstellar reveals that Cooper and his team spent twenty-three years, four months, and eight days in Earth time on Miller's planet, suggesting that they were roughly down there for only three hours and seventeen minutes.
Romilly calculated that a single hour on Miller's Planet would equate to seven years back on Earth. Because of the planet's proximity to Gargantua, the immense gravity of the black hole causes the planet to be roiled by massive tidal waves as tall as 4,000 feet.
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Why did it take 23 years in Interstellar?
Due to Gargantua's massive gravitational pull, “every hour on that planet is seven years on Earth”. After a massive tidal wave hits the spacecraft and delays their exit, they find that 23 years have passed on Earth.
TARS relays the quantum data to Cooper in Morse code. Cooper in turn relays the quantum data to Murph, in Morse code, through the hands of a wrist watch. Murph somehow knows it's her father relaying quantum data to her through the watch.
Murph was 10 years old when Cooper left. Cooper traveled for 2 years to the wormhole and subsequently lost 23 years in gravitational time dilation on Miller's planet.
Mann was marooned on this planet for 35 years, as evidenced by the 23-year time dilation on Miller, the two-year trip to Saturn and the launch of the Lazarus missions which predated Endurance's launch by ten years.
Miller's Planet was the Endurance's first stop. Upon landing, they learned that the planet was completely covered in water, with no land visible for miles. However, this ocean is not like the ocean on Earth, as the crew members are able to stand about shin-high in the water.
It is then revealed that he and Professor Brand knew that Plan A was impossible and that the only contingency that allowed for human continuity was Plan B. Mann did not want Cooper to return to Earth with the Endurance, as he now needed it to reach Edmunds' planet with the remaining crew to start a colony.
Who are the 5th dimensional beings in Interstellar?
The fifth-dimensional beings are not aliens; the fifth-dimensional beings are humans from the far, far, far future, who have evolved beyond the limits of the third dimension. These far future humans are now helping to create themselves by giving humanity the wormhole to a new galaxy.
The time dilation in movies such as Interstellar, however, relies on a different kind of warped time. In the film, there is an extreme amount of time dilation because the planet that the main character travels to, called “Miller's Planet,” orbits a black hole.
Murphy's Law states that if anything can go wrong, it will, sooner or later. Murphy Cooper (Jessica Chastain), who is named after the law, asks her father why he and her mother named her after something that's bad. To which, Cooper (Matthew McConaughey) replies, "Murphy's law doesn't mean something bad will happen.
Cooper gives Murph his watch. From inside the 'tesseract' of the fifth dimension Cooper sends a message using Morse code through the seconds hand of Murph's watch. It is the quantum data that will help humanity escape dying Earth. When she works out the formula, Murph shouts 'Eureka!
He ended up in the hospital bed because he went unconscious when the Tesseract was closing, and the 5th Dimensional beings transported him out of the black hole and assisted him through the Saturn wormhole. He was then found by rangers from cooper-station, and was taken into medical care.
The spaceship Endurance's destination is Gargantua, a fictional supermassive black hole with a mass 100 million times that of the sun. It lies 10 billion light-years from Earth and is orbited by several planets. Gargantua rotates at an astounding 99.8 percent of the speed of light.
Mann faked data about his planet's viability so Endurance would rescue him. Mann breaks Cooper's spacesuit visor and leaves him to die, and flees to Endurance on a shuttle; Romilly is killed by a bomb Mann set to protect his secret.
While fans may continue to hope for an Interstellar 2, the absence of concrete plans or release dates suggests that the future of the franchise is uncertain.
After finding his planet's conditions to be promising for human life, Edmunds sent a "thumbs up" signal back to NASA on Earth. He subsequently settled into hypersleep and awaited to be rescued. During this time, a rockslide occurred and destroyed his landing pod, causing Edmunds' death.
It took the spaceship 18 months to travel to the wormhole, then 23 years passed from exploring planet Miller. Murph said (cried) in the video to his dad that she is finally the same age as him when he left. Which tells us that she and her dad are both 35 years old toward the end of the movie.
On his deathbed, Professor Brand confesses to Murph that he lied about his Plan A's prospects – that he failed to “reconcile relativity to quantum mechanics” and his gravity project needs much more data. She takes on the project herself and beams out the bad news to space, where Coop and Amelia receive it.
