Galaxy velocities.?
I have read that from an arbitary central point, as in the Big Bang theory, whole Galaxies ,on the very limit of our percepcion, are in fact receding at close to light speed after accellerating outwards since the universe began, as mass would become infinite,how could it be possible for any increase in velocity to occur?
Answers:
The difference is that galaxies are receding, but they aren't really moving. Which seems like a whack idea on the surface. But consider the following thought experiment:
Let's imagine two strips of rubber. Each has a dot near one end. On the first strip of rubber, one inch from the dot, we'll put a live ant. On the second at the same spot we'll put a dead one. At the same time, we start the live ant walking away from the dot and we stretch the rubber strip of the second at the same rate. If you're standing on the dot, what differences would you observe?
The answer is pretty darn few. Both ants are moving away from you at the same speed, it's just the live one is moving under its own power while the 'universe' is moving the second one. And that's kind of what we have going on. We see lots of things move around on their own, but the universe itself is stretching and carrying many things away from us.
The interesting thing about the expansion of the universe is that it does not have to follow relativistic rules. An object can't MOVE faster than the speed of light, but there's no rule at all that says space can't expand at any speed it likes. Even FASTER THAN LIGHT.
Thus it's not really that the galaxies are accelerating away from us. They're comparatively stationary. It's SPACE that's making things difficult.
However, there is something even faster
beep beep
It's all a matter of whose inertial reference frame you're using. BUt more distant Galaxies **do** recede at higher velocities. But they don't exceed the speed of light. They just get 'red-shifted' so far that they're no longer visible (except to radio telescopes)
Doug
Accelerating? I thought they began slowing and keep doing so as they lose that initial velocity.
If the black hole appears more than twice, take care, a sysmic interference is about to commence, abort the mission or else.Spock
Physics is always right. Crossing the light speed is only an unfounded theory. If galaxies are not obeying then time to change that theory
That is why nothing travels faster than the speed of light. Once something has infinitie mass it cannot accelerate any more. But it never quite reaches this point. It approaches the speed of light asymtopically. Rather like if you keep dividing something in half you will never reach zero, you just get closer and closer but never quite get there. Similarly the mass never quite reaches infinity, and the speed never quite becomes the speed of light.
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Answers:
The difference is that galaxies are receding, but they aren't really moving. Which seems like a whack idea on the surface. But consider the following thought experiment:
Let's imagine two strips of rubber. Each has a dot near one end. On the first strip of rubber, one inch from the dot, we'll put a live ant. On the second at the same spot we'll put a dead one. At the same time, we start the live ant walking away from the dot and we stretch the rubber strip of the second at the same rate. If you're standing on the dot, what differences would you observe?
The answer is pretty darn few. Both ants are moving away from you at the same speed, it's just the live one is moving under its own power while the 'universe' is moving the second one. And that's kind of what we have going on. We see lots of things move around on their own, but the universe itself is stretching and carrying many things away from us.
The interesting thing about the expansion of the universe is that it does not have to follow relativistic rules. An object can't MOVE faster than the speed of light, but there's no rule at all that says space can't expand at any speed it likes. Even FASTER THAN LIGHT.
Thus it's not really that the galaxies are accelerating away from us. They're comparatively stationary. It's SPACE that's making things difficult.
However, there is something even faster
beep beep
It's all a matter of whose inertial reference frame you're using. BUt more distant Galaxies **do** recede at higher velocities. But they don't exceed the speed of light. They just get 'red-shifted' so far that they're no longer visible (except to radio telescopes)
Doug
Accelerating? I thought they began slowing and keep doing so as they lose that initial velocity.
If the black hole appears more than twice, take care, a sysmic interference is about to commence, abort the mission or else.Spock
Physics is always right. Crossing the light speed is only an unfounded theory. If galaxies are not obeying then time to change that theory
That is why nothing travels faster than the speed of light. Once something has infinitie mass it cannot accelerate any more. But it never quite reaches this point. It approaches the speed of light asymtopically. Rather like if you keep dividing something in half you will never reach zero, you just get closer and closer but never quite get there. Similarly the mass never quite reaches infinity, and the speed never quite becomes the speed of light.
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