# The Naked Scientists Forum

### Author Topic: Time travel  (Read 2827 times)

#### Royphelps

• First timers
• Posts: 1
##### Time travel
« on: 06/07/2006 23:38:00 »
If one was to travel away from earth at light speed for one year and then return to earth via light speed, would eveything on earth be aged more rappidly?  and if so how much?  Email me at Royphelps1@comcast.net

Roy E. Phelps

#### ukmicky

• Moderator
• Neilep Level Member
• Posts: 3011
##### Re: Time travel
« Reply #1 on: 07/07/2006 03:53:00 »
Sorry i'm not e-mailing you.

You cant travel a light speed. but if you could get close to it then yes time would travel a lot faster for anybody not travelling with you.

Michael

#### Nieuwenhove

• Jr. Member
• Posts: 27
##### Re: Time travel
« Reply #2 on: 07/07/2006 07:31:06 »
Hi,

This is simply calculated by :

Delta T' = Delta T / Sqrt (1 - v**2 /c**2)

where v is the velocity of the traveller, c the speed of light,
Delta T' the time passed on earth and Delta T the time experienced by the traveler.
Taking Delta T = 1 year and v = 0.99 c , one obtains Delta T' = 7.1 year. If v=0.999 c, one obtains Delta T' = 22.4 year.
So, in principle the time span on earth can be multiplied by an arbitrary large factor when coming closer and closer to the speed of light (in the limit, infinite).

#### The Naked Scientists Forum

##### Re: Time travel
« Reply #2 on: 07/07/2006 07:31:06 »