So apparently 'they' are saying there are galaxies 'out there' that are moving away from us FASTER than the speed of light ?
i love how suddenly people get bored and decide to make up new stories.
again, proof ? of all of this ?
i need concrete hard core tangible evidence please. No b/s theories.
- TardisAndTheHareLv 71 month agoBest Answer
EXPANSION OF SPACE-TIME:
If you place a stick of dynamite on a grid and detonate it, it will explode and send bits across the grid (this is called an explosion). The mass of the universe is not exploding. Rather, the grid (called space-time) is expanding.
FASTER THAN LIGHT:
Due to expansion of space-time, every object is moving away from every other object (and accelerating faster). The further away an object is, the faster it is moving away. Of course some objects are moving toward each other (but that is a local movement, such as two stars colliding). At a distance of 4300 parsecs, objects move away from each other faster than the speed of light (due to the expansion of space-time, not due to the velocity of the objects).
CAN'T SEE OBJECTS TRAVELING FASTER THAN LIGHT, SO WHY DO WE SEE THEM?
Because it takes billions of years for light to travel light-years, we see galaxies billions of years ago (as they used to be before they were traveling away from us faster than the speed of light).
- WhoLv 71 month ago
they aint "moving" faster than the speed of light
the "space" between us and them is
- Jim MoorLv 71 month ago
Actually, stuff goes faster than the speed of light (c). It's not only possible, but physicists work this type of problem all the time.
In fact, Einstein's speed equations are used for that very purpose, to calculate the "apparent speed" vs "actual speed" when the speed is greater than light.
Can a galaxy be going in one direction at .75c? Yes.
Can another one be going the opposite direction at .75c? Yes.
The formula is actually quite simple, for 1.5c you get the "real speed" as they are really traveling that fast. Einstein's Velocity Addition for this calc, as the pic shows, is .96c apparent velocity! No laws are broken. If they look at each other, they will apear to be traveling away from each other at 96% the speed of light, relative to each other.
Like many things in science, people tend towards an 'easy understanding', the truth gets kinda weird.
- nebLv 71 month ago
Kevin - you are on the right track with one of your comments about a grid of paper. Imagine a 12 inch ruler that expands as space expands. Imagine that locally space expands at one inch per second. Since each inch doubles every second, the ends of the ruler expands away from each other at 12 inches a second. So, expansion is very slow locally, but is cumulative over large distances. So, it is technically correct to say the space beyond the observation horizon of the universe is expanding away faster than light can travel through space, it is not really correct to say that space is expanding faster than light. It is expanding very slowly locally.
The proof comes from redshift of light from distant galaxies and stars. The expansion causes the wavelength of light to be stretched which shifts it to a lower frequency. We can also see proof in the CMBR. This light was originally generated at 1000’s of degrees but has been redshifted to a few degrees above absolute zero due to expansion.
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- YKhanLv 71 month ago
Yes, it's true, but the galaxies themselves aren't moving away from us, but their local spacetime is expanding away from our local spacetime at faster than the speed of light. The Theory of Relativity doesn't prevent that from occurring, as the speed limit is only valid within a local spacetime. Areas of space that are currently more than 14 light years away from us, are already outside what is called a Hubble Volume, where everything that is beyond that are already expanding away from us faster than light, but those inside it are still below the speed of light. It's very similar in concept to a black hole's event horizon
- YYYZZ 2Lv 71 month ago
Apparently NOT. Nothing has so far been observed that moves faster than light.
- RamonaLv 41 month ago
the word NASA is proof enough. They (the ones who go into the universe and on the moon etc....) are the ones who are telling everyone that there are other galaxies other than our own.
- GregLv 71 month ago
You would not be able to comprehend the proof. Do you understand the doppler effect?
- DzeLv 71 month ago
They have no idea what's going on .. the only explanation they could come up with is dark matter and dark energy to explain things ... that's something they have absolutely zero tangible evidence to even prove it exists they just made it up to make their other bullsht stories work ..