Skip to content
Science, Maths & Technology
Author:

Is time the same for everyone?

Updated Thursday, 25th February 2010

We all start off thinking there is just the one time – the same for everyone. Professor Russell Stannard illustrates how relativity theory shows this not to be the case.

This page was published over five years ago. Please be aware that due to the passage of time, the information provided on this page may be out of date or otherwise inaccurate, and any views or opinions expressed may no longer be relevant. Some technical elements such as audio-visual and interactive media may no longer work. For more detail, see our Archive and Deletion Policy

 

Video

                                    Transcript

 

Two people in relative motion have their own distinctive times. According to mission controllers on Earth, an astronaut in a spacecraft travelling to a distant planet will have a time that runs more slowly than their own. This is called time dilation. Lengths are also affected by speed. According to the astronaut, the distance between the earth and the planet is less than it is for the mission controllers. This is length contraction.

In spacetime, all of time (past, present, and future) exists on an equal footing - just as all of space exists on an equal footing. This would imply that the future, in a sense, already exists; it is just waiting for us to come across it consciously. But is spacetime truly real? Is it the reality? Might it not be just a convenient mathematical device? Opinion among physicists remains divided.

 

Author

Ratings

Share

Related content (tags)

Copyright information

For further information, take a look at our frequently asked questions which may give you the support you need.

Have a question?