Let's call "ideal" space a xyz-space where is no limit for speed. "Real" space is the xyz-space with maximum speed c.(adsbygoogle = window.adsbygoogle || []).push({});

Now, the speed c in real space is in many ways similar to infinite speed in ideal space:

1.

ideal: infinite speed is always observed as infinite, regardless the observer's (finite speed) motion

real: speed c is constant to all observers

2.

i: finite speeds are never constant, but relative

r: sub-c speeds are relative

3.

i: finite speeds can be added, and the results is always finite

r: sub-c speeds can be added (in certain way), and the result is always below c

4.

i: if infinite speed is added to a finite speed, the result is infinite

r: if speed c is added to a sub-c speed, the result is c (light emitting by moving particle)

5.

i: no particle with mass can have infinite speed (it would have infinite kinetic energy)

r: no particle with mass can have speed c

6.

i: kinetic energy of a particle can be arbitrarily large, with large enough speed

r: kinetic energy of a particle can be arbitratily large, with speed close enough to c

7.

i: for any finite distance, the travelling time can be arbitrarily short with large enough speed

r: for any finite distance, the travelling time can be arbitrarily short with speed close enough to c

This is a short list, maybe it could be longer. Anyway, I think I made my point clear. The light speed c has many, most or maybe all the qualities of infinite speed, without actually being infinite.

I have very much difficulty to understand (and accept) the light speed as a universal constant and an upper limit for speed. Of course I'm convinced it's true, but I can't help this. Do you think it's of any use to seek this kind of analogies? Or should we go with "just the facts"?

By the way: Does a wave of light (a photon in vacuum) have a reference frame? What would be actually observed there?

**Physics Forums - The Fusion of Science and Community**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Light-speed is infinite, in a certain way?

Loading...

Similar Threads for Light speed infinite | Date |
---|---|

B Is it true that a rocket at light speed has infinite mass? | Dec 14, 2016 |

Does mass become infinite near the speed of light? | Oct 12, 2014 |

Why are time dilatation & length contraction infinite at light speed? | Aug 1, 2014 |

Is the speed of light infinite? | Mar 20, 2013 |

Infinite mass at speed of light? | Nov 5, 2012 |

**Physics Forums - The Fusion of Science and Community**