I know it's impossible for a body with mass to reach that speed, this is a theoretical question.
That's why its impossible to push a mass to the speed of light because it takes "infiinte energy" which obviously isn't available...
Cheers,
Buffy
----------------
"If you do not agree with anything I say, I'll not only retract it, but deny under oath that I ever said it!"
__________________________________________________ ______________-- Tom Lehrer
The Hubble limit is where galaxies are receding at c. The light is no longer travelling fast enough to ever reach us. This limit is an event horizon. Relatively these galaxies are travelling at the speed of light.
This limit is an event horizon. Relatively these galaxies are travelling at the speed of light.
Slight correction: they are "traveling relatively" slower than light, but the expansion of the universe creates the perception of faster than light "speeds". In their local frame of reference of course, they may not be perceived to be moving at all (depeding on what the defined reference frame is...)..
Cheers,
Buffy
----------------
"If you do not agree with anything I say, I'll not only retract it, but deny under oath that I ever said it!"
__________________________________________________ ______________-- Tom Lehrer
Do we know any galaxies even appearing to recede close to the speed of light?
There was a great discussion of the above in the March 2005 Scientific American article "Misconceptions About the Big Bang." The basic idea here is that objects that are furthest away from us in the universe are "receding" at the greatest "relative speeds" and the Hubble limit is defined as the point at which they appear to be moving at the speed of light. If they're further away, they're "receding" at more than the speed of light and the light will never reach us. The article points out that most of this "speed" is simply the expansion of the universe and in local frames of reference, they're not moving at anywhere near the speed of light....
Cheers,
Buffy
----------------
"If you do not agree with anything I say, I'll not only retract it, but deny under oath that I ever said it!"
__________________________________________________ ______________-- Tom Lehrer
The reference frame is right underneath forehead. All other reference frames are null and void due to the theory of relativity. A galaxy, receding at c, would not appear to be travelling at c, however, because *you* would no longer see it.
Your Friendly Neighborhood Administrator
