Special relativity question: space travel and relativity of time

  • #1
137
2

Homework Statement



You are 20 years old and embark on a mission to a star system that is 200 light-years away. Your ship leaves Earth in 2013 and travels at 0.999c. You do not spend much time at the destination, just head back to Earth. What year is it when you arrive back on Earth? How old are you?

Hint: 0.999c = 299,700 km/s =22.4 seconds duration of one “tick” on a moving clock, as measured by an observer past whom the clock is moving

Homework Equations




The Attempt at a Solution



I converted 200 light years into km = 1.89216 * 1015 km / 299,700 km/s = 6,313,513,514 seconds

then...

6,313,513,514 seconds / 31,536,000seconds/year = 200.200 years

so it would be 2013 + 200.200 years = the year 2213 but my age would be 200.200/22.4 time dilation = 8.9375 + 20 (original age) = 29 years old.

Would that be correct? If not, can someone be so kind and explain to me how it's done? I find this theory very confusing. Thanks in advance!
 

Answers and Replies

  • #2
Orodruin
Staff Emeritus
Science Advisor
Homework Helper
Insights Author
Gold Member
17,316
7,163
What about the time the return trip takes?
 
  • #3
137
2
ah yes! so it would take roughly 400 years but in terms of age then ~18 years older. thank you very much!
 

Related Threads on Special relativity question: space travel and relativity of time

Replies
3
Views
590
Replies
5
Views
3K
Replies
1
Views
2K
Replies
12
Views
3K
Replies
3
Views
2K
  • Last Post
Replies
1
Views
663
Replies
2
Views
771
  • Last Post
Replies
3
Views
2K
Replies
3
Views
1K
Top