I wrote a post on time travel that is being featured over at Historical Fiction ebooks.
Theoretically, time travel into the future and into the past are two distinct concepts. Traveling into the future could happen merely by slowing down your own time, rather than popping in and out of the future like in the television show, Primeval.
Unfortunately, at the moment, the kind of time travel we want to experience—into the past—isn’t possible. Traveling in the future is only possible if we travel more quickly or more slowly than everyone else, but then we still can’t ‘get back’ to our own time: “If you want to advance through the years a little faster than the next person, you’ll need to exploit space-time. Global positioning satellites pull this off every day, accruing an extra third-of-a-billionth of a second daily. Time passes faster in orbit, because satellites are farther away from the mass of the Earth. Down here on the surface, the planet’s mass drags on time and slows it down in small measures … According to Einstein’s theory of general relativity, gravity is a curve in space-time and astronomers regularly observe this phenomenon when they study light moving near a sufficiently massive object.
What does this have to do with time? Remember: Any event that occurs in the universe has to involve both space and time. Gravity doesn’t just pull on space; it also pulls on time …
Read the rest over at Historical Fiction ebooks! http://hfebooks.com/is-time-travel-possible-by-sarah-woodbury/