Is Time Travel Possible?

Is time travel possible? Theoretical physicist and 2057 host Michio Kaku explores the possibilities.

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{ 13 comments… read them below or add one }

steve0619 February 10, 2010 at 4:01 pm

1.) Far too long for youtube comment, so dont ask :P but in short, mass increases as speed increases, such that mass would be infinate at the speed of light. Infinate mass takes infinate engery to accelerate, which there isn’t in the universe

2.) Many different type of clocks show the same result, and are perfect to einstiens equations, devices such as a light clock are not mechanical (though cesium clocks are used)

3.) growth rate, no. (our speeds are too low) However you mentioned carbon dat

steve0619 February 10, 2010 at 4:02 pm

Continued…

you mentioned carbon dating:

allthough carbon dating again takes too much time, other radioactive substances have been used which have a shorter half life and move faster. these are called (excuse my spelling, it is the greek letter meyew) myoo-ons / myew-ons

sorry i can’t spell lol! meuons

steve0619 February 10, 2010 at 4:07 pm

heres a better idea, stop spamming youtube and go read a book

steve0619 February 10, 2010 at 4:14 pm

Clocks used for measuring times this accurately are not related to the earths gravitational field.

such as cesium clocks / light clocks.

and in relation to your moon question, yes it does imply he has lost weight, however remember weight is a FORCE. It is by definition changed by the strength of gravity (w=mg).

However MASS is the same on the moon or earth. So this cannot be compaired to time dilation.

locoyo386 February 10, 2010 at 4:54 pm

@steve0619
1.) is it an equation on a physics book somewhere?

2.) are they still based on the ratation and orbital speed of earth. Or are they based on light trough a vacum?

3.) What other methods are used to determine age of the people that go into outer space?

locoyo386 February 10, 2010 at 4:55 pm

@steve0619
Yeah, I know which one you mean (the u shape funny looking one)

locoyo386 February 10, 2010 at 4:56 pm

@steve0619
Where can I find out all this information, really curious to check it out?

locoyo386 February 10, 2010 at 4:59 pm

@steve0619
By books I am assuming text books used in classrooms to teach physics and math.

locoyo386 February 10, 2010 at 5:01 pm

@steve0619
Yeah, I mentined weight because it’s easier to uderstand than mass. He would have the same mass no matter where he goes. The weight is due to gravitational force on the mass, There is a pound force and pound mass to depict the differences.

locoyo386 February 10, 2010 at 5:03 pm

@steve0619
The comment about time dialatin in respect to time travel still not answear. Is there an asnwear to that comment?

locoyo386 February 10, 2010 at 5:08 pm

I beleive that the concept of time is done in two ways. One is in relation to the progression of humans as we are born than we die. I call this real time or global time. The second is in regards to how fast the speed of light travels in a vacum. I call this the scientific time or local time. I believe tha the global time is constant, bu the local time can varie in relaton to light. Light is a very important part of human existance, thus we use it to measure everything that we can come accorss.

locoyo386 February 10, 2010 at 5:18 pm

OK, no more spamming from me. My last comment is;

Time travel is impossible
Time travel is irrelevant

Hope I see it done in my life time.

sillygames February 10, 2010 at 6:05 pm

“I think this is from were the question of wether time is constant or not stems from. Which is now shown as it is not constant.”

Not trying to be rude by repeating myself, but that’s what time dilation is. Time slows down. Light now takes “longer” to get somewhere. but space also contracts, so light takes “less time.” The effects perfectly cancel one another.

If you are really curious about this, I suggest reading a layman’s book on relativity. Chat is a poor medium for education.

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