Time is measured in seconds, hours, days, months, years, decades, centuries, millenniums, etc. The concept of now is defined using the exact second, hour, day, month, year, etc. that it is now. It is possible to travel into the future, we just don't know how yet.

There are many many theories about time travel. The Englishman Sir Isaac Newton (1643-1727) thought that time was an important building block of the universe. Leibniz and Kant did not think it was possible to travel in time.

The speed of light is one of the main ideas in some of the newest theories. The speed of light
is 186,000 miles per second or 3x10^8 meters per second. It is known to be as fast as you can go. This means going faster than the speed of light will take less time than anything else. The physicist Albert Einstein (1879-1955) found in his theory of relativity that it is very hard to go as fast as the speed of light. He also thought that space is warped, meaning if you keep traveling you will eventually return to where you started.

Going into the past is mathematically impossible according to some current theories, but it must be possible to repeat something until it is correct (This happens in everyday life). We could probably build something that would be what will happen in the future or happened in the past.

We are always moving into the future. As I am writing this, we have moved a few seconds into the future. Every hour, next year, ten years from now, one hundred years from now, are all in the future. Counting it is only mechanical. A year is the amount of time it takes the earth to travel around the sun. A day is the amount of time it takes the earth to revolve on its axis. These are just measurements. Many trees including the Sequoia were here thousands of years before we
were born. Black holes were recently discovered in astronomy, and they might unlock the secret
to time travel.

In Around The World in Eighty Days by Jules Verne, Phileas Fogg makes a bet he can travel around the world in less than eighty days. He wins the bet because when he arrives back to where he started he has one extra hour because of the time zones. We can do about the same thing by traveling across a time zone, like Pacific Time to Mountain Time. In Planet of The Apes, starring Charlton Heston, the spacemen are put to sleep for thousands of years to travel into the future. In The Time Machine by H.G. Wells, a scientist invents a machine that can travel into the distant future. There is a movie that closely follows the book starring
Rod Taylor and Yvette Mimieux. In Back to The Future (including Parts II and III), a younger person named Marty McFly (Michael J. Fox) and his older friend (Christopher Lloyd) invent a time machine that is a De Lorean car. When it is traveling into the future, it also flies through the air. When the car lands it runs just like a regular automobile.

http://www.iep.utm.edu/t/timet rav.htm

http://en.wikipedia.org/wiki/T ime

http://en.wikipedia.org/wiki/S ir_Isaac_Newton

Learn more about this author, Steven Mars.
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