If the Universe is 13.7bb yrs old and started from a point and nothing can move faster than light, how can we see any objects >6.85bb light years away. Object takes 6.85bb yrs to get to where it is and 6.85bb yrs for the light to get to us = 13.7bb years
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Anonymous
ANSWERS: 9
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The far reaches of the universe are expanding away from us at faster than the speed of light. This does not violate relativity -- nothing can move THROUGH SPACE faster than light, but SPACE ITSELF is capable of carrying objects away from each other faster than light speed. It seems counter-intuitive but it's true.
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According to what Scientist say we are seeing the past. I have a feeling you are in the Science field and want to see if anyone else knows this. I took many Science Classes in College. I watch Science Channel all the time. Science is so cool if people only gave it a chance. Science Channel canceled Brink because the ratings were bad. It does not make me feel good because people in America do not comprehend simple Science. If they did they would not still be taking antibiotics to kill cool germs.
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... the rate at which space itself expanded from a single point to the current vast universe (which is still expanding) has exceeded the speed of light ... this proven fact is the foundation for science fiction "warp drive" theories that try to warp space in such a way that the contents of the warp bubble are moved along within one unit of space as that entire unit of space is moved faster than light while within the warp bubble the contained object remains slower than light ... it is the warping of the space that allows for this ...
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Einstein hypothesized that if you were traveling at the speed of light and turned on a flashlight the light would be traveling away from you at the speed of light. If he is right light can travel faster than the speed of light. Of course I am no scientist.
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No - we don't have to consider the time for th object to have reaches wehare it is. We can see objects 12 bullion years ago by the light they emitted 12 billion years ago. The stretching of space means that we can see things that are somewhat further away than 12 billion years - the billion light years first crossed is now 2 billion wide, having stretched since the light crossed it. So we see things in their right order, but further apart than they were when they emitted the light and with their light red-shifted.
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some people like to think themselves smarter than they ever will be ...
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becuase we have telosope to do that job.
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Let me try to demonstrate. You need to consider that space itself is expanding, as well, so... Observer........Object p stands for photon, fyi, and note that at time = 0 we have exactly eight spaces between the observer and object Observer.......pObject t=1 Observer......p...Object t=1, space has expanded by 1 space, and the object has moved away by one space. t=2 Observer.....p.....Object t=3 Observer....p.......Object t=4 Observer...p.........Object t=5 Observer..p..........Object And so on for another three time steps, such that the photon actually arrives at the observer. As you can see, by that time, the Object is now 16 spaces away from the observer, yet we're only 8 time steps into the system, and the light we observe from the object originates at t=0
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The distance of objects that far away is not actually known for certain, but is calculated based on our understanding of how the universe has evolved, and the properties of the light we observe coming from the objects. These distances are calculated based on the "red-shift" observed on the object. Space is constantly expanding, and as it does so, it stretches out the light that is travelling toward us from distant objects. The longer the light has been travelling, the more it gets stretched. This stretching actually changes the color of the light, making it redder. Looking at the spectrum of the light, we can tell how much it has shifted. Working backwards from that, we can tell how long the light must have been travelling in order to shift that much. This assumes we correctly know how fast the universe is expanding. So, the light itself tells us how long it has been travelling. There are some cosmology calculators on the net that will calculate ages based on redshift numbers. Here is a thread that talks about these calculators and how it is calculated: http://www.physicsforums.com/archive/index.php/t-69285.html
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