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Originally posted by ManFromEurope
reply to post by smithjustinb
Light escaping from a "condensed space-time" would expand along the expanding space-time. So you wouldn't see a bright knot in the center of the galaxy as the light coming from there would expand, too.
You have to look at a place of "condensed space-time" from within - you wouldn't find any difference to places outside that area. So to say, light would still go only 300.000 km/s, even if the km would be "shorter" seen from the outside. Its related to Einsteins theories.
Originally posted by smithjustinb
Originally posted by ManFromEurope
reply to post by smithjustinb
Light escaping from a "condensed space-time" would expand along the expanding space-time. So you wouldn't see a bright knot in the center of the galaxy as the light coming from there would expand, too.
But wouldn't you though? Since the light in the "condensed spacetime" is more densely compacted, then wouldn't it also escape in a densely compacted way? So it would still be densely compacted, but would also be moving at normal speed.
You have to look at a place of "condensed space-time" from within - you wouldn't find any difference to places outside that area. So to say, light would still go only 300.000 km/s, even if the km would be "shorter" seen from the outside. Its related to Einsteins theories.
I kinda see what you're saying. But if light speed reamains constant over a "shorter or longer km", how would it not be observed as moving slower or faster resepectively?
It would be. 300,000 km/s. If a km in compressed spacetime is equal to two km in normal spacetime, then the light is actually observed as moving 150,000 km/s.
Originally posted by ManFromEurope
It would be. 300,000 km/s. If a km in compressed spacetime is equal to two km in normal spacetime, then the light is actually observed as moving 150,000 km/s.
No - as far as I would think, light would be seen at 300.000 km/s regardless of your subjective system, just like in Einsteins relativity formulas. Light goes at 300.00 km/s in vacuum - thats an axiom of Einstein, I will take it for this for granted, as there is no known (or even possible?) counter-evidence. Even if you would ride a rocket going 299.000 km/s and you would light a beam straight ahead, it would still go with a relative speed of 300.000 km/s away from your rocket.
Originally posted by ManFromEurope
Originally posted by smithjustinb
Originally posted by ManFromEurope
reply to post by smithjustinb
Light escaping from a "condensed space-time" would expand along the expanding space-time. So you wouldn't see a bright knot in the center of the galaxy as the light coming from there would expand, too.
But wouldn't you though? Since the light in the "condensed spacetime" is more densely compacted, then wouldn't it also escape in a densely compacted way? So it would still be densely compacted, but would also be moving at normal speed.
But as soon as the light leaves that compacted spacetime, it would unravel itself, lenghten itself (under a red-shift into gamma-radiation, I think) and would therefore look like light escaping from a place of normal spacetime. Problem is, WHAT is a condensed spacetime, really? Is there a gravity-well, like a black hole or another highly compressed and very heavy body? How does the condensation work? Spacetime just shrinked - well, that sounds like a blackhole to me.
Originally posted by ManFromEurope
Look at a blackhole like Einstein described it: On board a rocket which comes close to the event horizon, you would feel that you are just "right now" are falling into the blackhole. An observer outside would think that your speed declined to very near 0 km/s the closer you get to the event horizon.
This time- and spacedilation would happen in a condensed spacetime, as long as its effects are based on gravity (which defines spacetime under Einsteins rules). Thus there would be effects regarding your light, escaping from that place.
As light "climbs up" the gravity well of a condensed spacetime, it would loose energy, which would NOT slow it down, but shift its wavelength into infrared and deeper (longer) wavelengths, regarding to the amount of lost energy. It would not slow down.
Originally posted by smithjustinb
Now that is weird. So light never changes speed and if you go faster, it does too, but at the same time it doesn't?
If I'm travelling at 299 km/s the light I see would still be travelling at 300 km/s away from me? I can't understand why a person standing still watching all of this go on would not see the light traveling at 599 km/s.