One of the key scenes from the movie Interstellar was when Matthew McConaughey's, Anne Hathaway's and Wes Bentley's characters landed on a planet that was near a black hole, while David Gyasi's character stayed on an orbiting space ship.
The plot point was that on the planet, gravity from the black hole would affect time according to Einstein's theory of relativity, causing those on the planet to de-sync with those on the spaceship.
With the landing party spending a few hours on the surface, more than 20 years passed aboard the spaceship.
The Interstellar challenge is: How many times did the planet rotate over the duration of the voyage of the landing party?
The plot point was that on the planet, gravity from the black hole would affect time according to Einstein's theory of relativity, causing those on the planet to de-sync with those on the spaceship.
With the landing party spending a few hours on the surface, more than 20 years passed aboard the spaceship.
The Interstellar challenge is: How many times did the planet rotate over the duration of the voyage of the landing party?