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Message 1301016 - Posted: 1 Nov 2012, 16:58:47 UTC
Last modified: 1 Nov 2012, 17:01:43 UTC

Albert Einstein's famous equation states that E=mc2.

But where is time in all of this? Are we able to assume t or T for time and if so, is it a constant?

Are we assuming all the time that the speed of light is a constant as well?

Or maybe c rather is dependant on its environment or surroundings?

Musicplayers part post above is interesting. When Einstein drew up his equation
he initially did not set "C" as a constant but just given the value as measured
at that time. Upon pondering over his equation he decided to make "C" a constant
for he "assumed" the speed of light was always that what he measured it at.
The burning question here is, "Was he correct to assume this"?

As Musicplayers further states, " 'C' rather dependent on it's environment"
I think that's a very valid question for if 'C' has had different values over
time then dating the age of the universe is going to be quite impossible. If 'C'
at earlier times was slower, then the age of the universe is going to be less.
I think the speed of light has varied over time but I only think this. Some
physicist have stated that they think there's evidence to show that light at
one time was travelling faster than it is today. Using this this scenario
then the universe could be older than we currently calculate.

Coming back to a point I raised in an earlier post, on creation of our universe,
if light was one of the last components to be formed just how far had the
universe expanded before light came into play. Without light with it's limits
coming into play, though for a very short period of time, the universe could
have expanded to half the size we have today before light came a long to put
some brakes on to it's rate of expansion. At the point that light was finally
created here did this light react with the existing energy so creating then all
the matter we have.
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Message 1302588 - Posted: 5 Nov 2012, 20:08:47 UTC - in response to Message 1300802.

but in the emptiness of space.. there is no 'mass' :P

Even in empty space, there is about one hydrogen atom per size of a grape fruit, so not even space is completely void of mass. Years ago, I read of a possible earth based space craft that could theoretically obtain about 86% of the speed of light that would shaped like a huge scoop close to the size of the moon, that would scoop up those hydrogen atoms, and fuse them as a propulsion source that is self fueling. Of course that is not practicle, but theoretically possible.

Steve


You're the last person I'd ever want to argue physics with, Steve, but the Ram Scoop engine you are talking about wouldn't work at higher speeds. Scooping up those atoms robs momentum from the spaceship which is, presumably, gained back when you launch it out the back end. The faster your exhaust, the better, of course but it is hard to imagine a jet velocity of even half of the speed of light. (Just a few percent is more likely.) and attempting to go faster than the jet speed means that it costs more energy to scoop them up than you get out of them.

Fair enough. It was based on a fusion reaction, and I just remembered reading about it many years ago, and haven't seen anything about it since. I am pleased you are familiar with it also. The other point is that there are free floating hydrogen atoms in "empty" space.

Steve


<<< Larry Niven fan. :P

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Message 1303726 - Posted: 8 Nov 2012, 21:20:34 UTC
Last modified: 8 Nov 2012, 21:22:19 UTC

(Apologies for the multiple puns ;-) )

Taking a bit of a sidestep, an example of real science in action:


'Twisted light' data-boosting idea sparks heated debate

An idea to vastly increase the carrying capacity of radio and light waves has been called into question.

The "twisted light" approach relies on what is called light's orbital angular momentum, which has been put forth as an unexploited means to carry data. ...



All a question of what effects and what view. However, note how the abstract and encoding can themselves be "faster than light (or the medium being used)"...

Also note the refreshingly public research debate that so often today is so badly stifled by conspiracists and overly sensitive and shallow funding bodies...

Keep searchin',
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Message 1311134 - Posted: 28 Nov 2012, 19:54:55 UTC

Meade posted this story on my Facebook timeline yesterday. Thought it might make for an interesting read.

NASA's First Warp Drive
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Message 1316238 - Posted: 16 Dec 2012, 22:27:41 UTC

Of course there's the idea of being able to Jump from one point in space to another(A to B), like in the TV Series 'Battlestar Galactica', I don't know if how that could take place, but it's interesting as ideas go and of course, it's not FTL.
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Message 1316248 - Posted: 16 Dec 2012, 23:02:25 UTC - in response to Message 1311134.

Meade posted this story on my Facebook timeline yesterday. Thought it might make for an interesting read.

NASA's First Warp Drive

Well Bill, it's interesting to say the least. If it's feasible then one would
expect to see, in time, more scientist's writing and commenting on it's
practicability.


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Message 1316260 - Posted: 16 Dec 2012, 23:29:33 UTC - in response to Message 1311134.

Meade posted this story on my Facebook timeline yesterday. Thought it might make for an interesting read.

NASA's First Warp Drive

Nice link bill, thanks.

Victor
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Message 1316528 - Posted: 17 Dec 2012, 20:03:16 UTC
Last modified: 17 Dec 2012, 20:09:01 UTC

I have always believed that man could travel faster than light. Now I know that I was always right.

    1. I am sure that ET has been here before. They couldn't have done that without faster than light speed.
    2. Einsteins laws are still valid.


Perhaps this 21st December will really bring an end to the old world, and a new one, as is predicted. Repeal the USA gun laws, and reach out into space.

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Message 1316684 - Posted: 18 Dec 2012, 4:19:20 UTC - in response to Message 1316528.

Repeal the USA gun laws, and reach out into space.

Isn't that: fire all the guns at once, explode into space?

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Message 1316919 - Posted: 19 Dec 2012, 0:26:41 UTC

The major problem (besides the obvious technical hurdles) would be the required energy budget.

One of the most basic rules of the universe is that to move an object from point A to point B requires energy. Generally speaking, the further you want to move and object and the faster you want to get it done the more energy you'd need to make it happen.

I have no idea how it would be calculated but I'd guess you'd need the combined energy output of at least several suns to make it work.
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Message 1316924 - Posted: 19 Dec 2012, 0:44:58 UTC - in response to Message 1316919.
Last modified: 19 Dec 2012, 0:46:27 UTC

I remain a skeptic. let's see if a working model can be constructed in a finite amount of time for a finite amount of money.

Thoretically anti-matter aniliation is also very efficient but I don't expect to see a working model of a practical engine in my lifetime.

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Message 1317115 - Posted: 19 Dec 2012, 13:56:34 UTC
Last modified: 19 Dec 2012, 13:57:02 UTC

Anyone speak Tau Cetian?


Tau Ceti

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