Update:
New movie outline based on a theoretical reality:
An unmanned space ship has been tested for very short times
approaching half the speed of light. Now it will be tested
with a human crew and they will push on to higher speeds.
Before the test the captain of the crew bumps into a physicist
at a bar on the east coast of the US who tries to warn him of what
might happen on the test flight.
Next scene:
The captain and crew are in the ship in space and everything is going
good they are heading back toward the inner solar system and earth.
All the tests went great and they are traveling very near the speed of light.
As they fly by the inner solar system their instrumentation read out
tells them that earth is 900,000 miles from the sun. They observe that the earth
doesn't look normal. The crew decelerates the ship and lands on earth.
They find that there is no atmosphere or water and the earth is dead.
The crew converts their date and time back to earth time on the east coast of the US,
12:00 noon March 15, 3042. They realize they can't go home.
Next scene:
The physicist that tried to warn the captain is standing next to a hotdog stand somewhere
on the east coast of the US. It is a beautiful day. A clock on a nearby building
says 12 noon. He is reading the news on his phone. The date is March 15, 3042.
The head line reads "New ship returns crew healthy".
While eating his hotdog he realizes the crew that left are not the clones that returned.