Light speed to my knowledge is quite exactly 300.000 km/sec. Our Universe since the "Big Bang" is expanding by roughly 300 km/sec. Is our value of "light speed" related to the starting point in the Universe which is not moving or is it related to our moving system?
Background of the question:
For accelerating a mass to light speed a certain amount of Energy is required (Is this the E= mc square equation?). Is the energy which the Big Bang contributed to accelerate our own mass a deductible contribution reducing my own effort accelarating a mass or do I have to take my own starting point as "zero"?
I found different values for the speed of expansion of the Universe. I took the one above (300 km/sec) because it is so comfortably one tenth of a percent of the light speed value.
By accelerating small masses in particle accelerators like CERN those protons, electrons, photons or whatever come close to light speed in an experimental circular "orbit". At one point of the circle the particle must move into the same direction like the Universe (Point A), another point must be exactly opposite to the moving direction of the expansion, Point B. The mass "0" of the particle is measured on our planet, therefore it is a mass being already in motion. Do those particles in point B loose one tenth of a percent of their mass regaining it when they are accelerated by the Universe's and CERN's efforts?
One more related question of interest: If CERN reaches velocities for particles "close to light speed", have those in reality not crossed light speed in Point A, assuming that the difference of CERN speed to light speed is smaller than the expansion velocity of the Universe?
Which Speed Is Regarded As "Lightspeed" in Relation to the Speed of Expansion of the Universe?
2012-04-24 3:51 am
回答 (4)
2012-04-24 4:19 am
✔ 最佳答案
Stick to History. You don't have enough of a background in Physics to formulate your question, which is senseless.There is no point in answering you, even if an answer could be given to what is a mishmash of nonsense.
2012-04-24 11:03 am
The Universe is not expanding at a constant velocity: the velocity increases with distance.
The dynamics of the expansion are governed by the Friedmann solution to the Einstein Field Equations of General Relativity. To understand it properly requires that you learn General Relativity.
The dynamics of the expansion are governed by the Friedmann solution to the Einstein Field Equations of General Relativity. To understand it properly requires that you learn General Relativity.
2012-04-24 11:10 am
You are making an incorrect assumption, which is that the expansion of the universe has a single speed. It doesn't. Rather, the speed of expansion is instead proportional to distance. In fact, the ratio of speed to distance is given a special name - the Hubble constant.
2012-04-24 11:09 am
The "speed of light in a vacuum" is exactly
299,792,458 m/s
The rate of expansion of space is roughly 70 km/s per Megaparsec.
This rate is linear (if you look at a distance of ten Mpc, the rate is 700 km/s)
(if you look at a distance of 20 Mpc, the rate is 1400 km/s)
There is no acceleration of objects involved. What happens is that new space is added everywhere at once (or, if you prefer, space is "stretched" everywhere at once) so that locally, the effect is very tiny. For example, over the entire Solar system (say 3.26 light-years if we include the Oort cloud), the amount of expansion is 7 cm per second (yes, centimetres).
At a distance of 13.7 billion light-years, (4,200 Mpc), the rate is equivalent to the speed of light. THAT is the real reason we cannot see further than that.
We know that the universe is much bigger than that, but we will never see any of the things that are outside this region, because the amount of space between us and any of these things is growing faster than the speed of light. But the things themselves could be stopped (like we are) relative to their local space. These things are NOT running away from us at neckbreaking speeds.
At a point, there is no such thing as a "direction of expansion". All parts of the universe are expanding (new space being added between any two points.
What really happens is that the distance between any two points keeps growing, but the points themselves are not moving relative to their own local space.
299,792,458 m/s
The rate of expansion of space is roughly 70 km/s per Megaparsec.
This rate is linear (if you look at a distance of ten Mpc, the rate is 700 km/s)
(if you look at a distance of 20 Mpc, the rate is 1400 km/s)
There is no acceleration of objects involved. What happens is that new space is added everywhere at once (or, if you prefer, space is "stretched" everywhere at once) so that locally, the effect is very tiny. For example, over the entire Solar system (say 3.26 light-years if we include the Oort cloud), the amount of expansion is 7 cm per second (yes, centimetres).
At a distance of 13.7 billion light-years, (4,200 Mpc), the rate is equivalent to the speed of light. THAT is the real reason we cannot see further than that.
We know that the universe is much bigger than that, but we will never see any of the things that are outside this region, because the amount of space between us and any of these things is growing faster than the speed of light. But the things themselves could be stopped (like we are) relative to their local space. These things are NOT running away from us at neckbreaking speeds.
At a point, there is no such thing as a "direction of expansion". All parts of the universe are expanding (new space being added between any two points.
What really happens is that the distance between any two points keeps growing, but the points themselves are not moving relative to their own local space.
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