What is this "time travel" these popular blogs refer to? I am getting confused by some "popular science" about time travel, such as 



or "Time Travel Is Real. Here Are the People and Spacecraft Who Have Done It":



It is indeed an interesting property of physics as we know it, and a great gift from the theory of relativity. It leads to useful perspectives on the nature of time as exemplified in the Twin Paradox example: When you travel for instance at a Lorentz factor of γ = 100 (99.995% the speed of light) for 10 years, time "dilates" to thousand years. For instance it has been proven experimentally that muons would "tick" slower, and therefore for a measure of time in seconds. Similarly, I would assume that extending this property at a macroscopic scale, your whole body would slow down... 

My question is to know if will you "live for a thousand years" (internet abounds of such statements as in this example forum and may be interpreted as such in the headlines above), or rather that during the 10 years of your travel (in your spaceship) and which would be measured as 1000 years in another frame of reference (the  earth), you would have aged by "only" 10 years in your spaceship - time "froze" during the travel.
My question is to know if will you "live for a thousand years" (...) or "only" 10 years in your spaceship - time "froze" during the travel.


If you were to travel to close the speed of light (not doing the math, plainly speaking), you would appear to live for a thousand years to the people that are outside of your frame of reference. Time would actually pass the same to you and you would observe the time outside your frame of reference to pass significantly faster.


  Is it a scientific fact?


Human time travel is a very real scientific fact, but the implications are too complex to be presented to the public sphere since it has no practical applications yet. If we were to sent people to another star system (Alpha Centaury A/B - at 4.3 light-years from Earth), accelerating their ship close to the speed of light would make the time in their frame of reference pass slower relative to the outside of their frame of reference, thus allowing them to reach the destination in a shorter time from their perspective. It would be useful when managing supplies on this vast journey.