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QUESTION: Hi,

Thanks for your reply. I read that light is an electromagnetic wave. Hence, aren't the electrons more fundamental to light in determining the time? Has science discovered how electrons and sub-atomic particles came into existence?

Also you wrote that in case of worm holes, there is a remote possibility of travelling to past. Travelling to past would require the construction of previous events even to the atomic level, how would that ever be possible?

regards.

ANSWER: No, they are not.  It's the constant speed of light that's fundamental in determining time.  And no, we have not discovered how the universe came into existence (with everything in it), or why there's more matter than anti-matter in the universe...that's a question scientists are hard at work on right now.

When it comes to the time travel question, not really, a fundamental problem with traveling to the past with wormholes.  You cannot travel back in time to before the machine was created, so you're not really reconstructing things from nothing, but creating a tunnel through space and time that can allow you to transmit new information back to the past in a kind of loop.  The energy required could easily create new matter, no one truly understands physics on such an extreme level.

---------- FOLLOW-UP ----------

QUESTION: Hi,

Thanks for your reply. What is making light so unique that its speed determines time. Why light's speed is constant even when the object holding it is moving? Is there any explanation or it is just as it is that we have to accept..

Answer
The way that a changing electric field creates a magnetic field and vice-versa are fundamental properties of spacetime itself.  The measured properties of such fluctuating fields results mathematically in solutions with a defined wave speed in empty space.  That speed is the speed of light, and it does not depend on the motion of an observer.  This was the genius of Einstein, he recognized the fundamental truth in that solution, that the speed of light was the same for all observers.  It's hard to wrap your mind around, but many fundamentally true things are.

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Dr. Stephen O. Nelson

Expertise

I can answer most basic physics questions, physics questions about science fiction and everyday observations of physics, etc. I'm also usually good for science fair advice (I'm the regional science fair director). I do not answer homework problems. I will occasionally point out where a homework solution went wrong, though. I'm usually good at explaining odd observations that seem counterintuitive, energy science, nuclear physics, nuclear astrophysics, and alternative theories of physics are my specialties.

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I was a physics professor at the University of Texas of the Permian Basin, research in nuclear technology and nuclear astrophysics. My travelling science show saw over 20,000 students of all ages. I taught physics, nuclear chemistry, radiation safety, vacuum technology, and answer tons of questions as I tour schools encouraging students to consider careers in science. I moved on to a non-academic job with more research just recently.

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Ph. D. from Duke University in physics, research in nuclear astrophysics reactions, gamma-ray astronomy technology, and advanced nuclear reactors.

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