Hell call me a nerd... I love this stuff. When I was a kid I would read books about project Deadalus and stuff like that.
jharkin, and Nova
Correct - the perspective is he "relative part" It has something to do with the fact that the speed of light is constant regardless of your speed that makes time relative. ie light is beaming at at us both from the sun at the same speed. You stand still and I fly toward the sun at half light speed. The light should appear to be moving to me faster due to my moving toward the sun (remember all those "2 trains leave the station" word problems). However relativity says that I will see the light moving the same speed as a stationary person. the solution to that seeming paradox is to make time slower in my frame of reference (remembering speed is distance/time).
Its all about our perspective.
Or something like that.. I'm not a physicist I just get this stuff from books.
So a watch strapped to a beam of light will take 4.2 years.
And a watch strapped to my wrist would show 5 years if I traveled at .85 light speed ( assuming instant acceleration and deceleration )
I *think* the rule says that a watched strapped to a light beam wouldn't move at all.
A watch strapped to the wrist of the traveler would slow down and show 2.5 years
A watch on the wrist of somebody left behind on earth would show 4.2 years for the beam of light and 5 years for our traveller moving at .85C.
Correct about the part assuming instant acceleration and deceleration. What Ive read is that the reality is that with a rocket engine accelerating at one earth gravity it takes just over a year to reach a high % of lightspeed.
T-Rex 450 fbl conversion
alot of planks