Warp speed spacecraft anyone?

[Denny Crane]

Well, yeah.

But if the place in space we occupy was 1 light year away from a source that's now 13B light years away, the light from that source would have passed us long long long ago.

 

[3RA1N1AC]

which im sure it has

theoretically, if the universe is infinitely big, then the number of galaxies whose light we will never see again is infinity. times infinity.

or else holy shit it would be bright as fuck at night time

 

[Denny Crane]

which im sure it has

theoretically, if the universe is infinitely big, then the number of galaxies whose light we will never see again is infinity. times infinity.

or else holy shit it would be bright as fuck at night time

If it has, we wouldn't be seeing it today. We would have seen it 6B years ago, or whenever

 

[3RA1N1AC]

hey, im just spitballing here

like i said before, logically, any light we are seeing now was coming from something that was not moving faster than the speed of light at the time it was emitted.

or maybe its god testing our faith, or a glitch in the matrix, or the oft beguiling enigma of the mysteriosphere

 

[Denny Crane]

If the space between the two objects expands faster than light, then the light never reaches us. If space expands less than light speed, the light from numerous objects would have long passed us by. But we're seeing them.

 

[3RA1N1AC]

its not a single flicker of light though, a sun can burn for billions of years. our own suns light "passed us by" yesterday.

yet today, more light.

as far as the universe expanding faster than light, anything we can see, is either not expanding away from us faster than the speed of light (yet), or the expansion hasnt caught up with the light (yet).

when it does, its gonna be spooky out

 

[PapaG]

we are seeing the light from the past, how fast a galaxy is currently moving away from us now is of zero importance. logically, a galaxy was not moving faster than the speed of light during the moment the light was emitted, so the light was able to "outrun" the universes expansion and travel towards earth for us all to marvel.

basically, the idea is that independent pairs of galaxies are moving at different speeds with respect to each other and the further the galaxies are from each other, the faster they are moving apart. so the furthest light we can see, yes, is not long for this world, but closer light being emitted might still be burning for us to eventually see. i dont know about that.

eventually the universe will expand to the point where billions of years from now all light in the night sky will cease to exist except from only the closest galaxies, and eventually even they will appear to burn out. it is going to totally freak out the cavemen.

Wouldn't we be seeing the same light as when the Big Bang occurred, if that's the case? Or have there been other Big Bangs, throwing out various levels of stars and such? What is the speed of the universes expansion, since the universe is infinite?

 

[Denny Crane]

its not a single flicker of light though, a sun can burn for billions of years. our own suns light "passed us by" yesterday.

yet today, more light.

as far as the universe expanding faster than light, anything we can see, is either not expanding away from us faster than the speed of light (yet), or the expansion hasnt caught up with the light (yet).

when it does, its gonna be spooky out

All true. But light we're seeing from near 13.7B years ago had to originate at the time of the big bang, about the same time all of everything was REALLY close together.

 

[3RA1N1AC]

if whats the case?

and like i said, just spitballing here, but its interesting to think about things that dont make sense

 

[3RA1N1AC]

All true. But light we're seeing from near 13.7B years ago had to originate at the time of the big bang, about the same time all of everything was REALLY close together.

why would it have to? im not up on the new space knowledges

 

[Denny Crane]

The answer isn't going to be a common sense one. But the math will work

 

[3RA1N1AC]

which math is that?

 

[3RA1N1AC]

i mean, its only logical, the oldest photons we can see are the ones that have traveled from just before the distance at which light can’t close the gap and outrun expansion

 

[Denny Crane]

The math that says distance = rate x time allows light to not exceed the speed of light but travel more than a light year in a year's time.

 

[PapaG]

if whats the case?

and like i said, just spitballing here, but its interesting to think about things that dont make sense

He Gets Me!!! The unlikeliest of allies.

 

[PapaG]

i mean, its only logical, the oldest photons we can see are the ones that have traveled from just before the distance at which light can’t close the gap and outrun expansion

Which brings up, why are there older photons? Aren't photons infinite? Or are there photons being "born" all the time in the universe? If so, why was the Big Bang such a one of a kind event?

 

[Denny Crane]

No, atoms are not infinite.

Photons first appeared extremely early after the big bang.

 

[PapaG]

No, atoms are not infinite.

Photons first appeared extremely early after the big bang.

Again, why are there older photons? Shouldn't all photons and masses been traveling at the same speed after the Big Bang?

 

[Denny Crane]

Chaos.

They bump into each other.

 

[3RA1N1AC]

70 kilometers per second per megaparsec

 

[3RA1N1AC]

whoops

70 kilometers per second per megaparsec of distance between two objects is the rate of expansion, so i guess with that and the speed of light you can figure the rest out!

let me know

 

[PapaG]

Chaos.

They bump into each other.

That's a theory. Not a fact. Prove it. The bumping together would be still happening, so chaos amongst proton colliding would be constant. Or did chaos theory for protons only happen during the Big Bang?

 

[Denny Crane]

http://www.universetoday.com/29971/most-distant-object-ever-seen/

600M years after the big bang.

http://www.universetoday.com/37409/how-big-is-the-universe/

Universe is 150B light years across

https://www.khanacademy.org/science...pansion-topic/v/radius-of-observable-universe

They seem to be able to visualize it.

 

[Denny Crane]

That's a theory. Not a fact. Prove it. The bumping together would be still happening, so chaos amongst proton colliding would be constant. Or did chaos theory for protons only happen during the Big Bang?

http://image.gsfc.nasa.gov/poetry/ask/a11354.html

 

[PapaG]

http://image.gsfc.nasa.gov/poetry/ask/a11354.html

That's not proof. LOL

Hint: Your link talks about the sun, not the Big Bang. Haha

 

[Eastoff]

Again, why are there older photons? Shouldn't all photons and masses been traveling at the same speed after the Big Bang?

That's a theory. Not a fact. Prove it. The bumping together would be still happening, so chaos amongst proton colliding would be constant. Or did chaos theory for protons only happen during the Big Bang?

Which one are you talking about? Or are you talking about two different topics?

Photons are absorbed constantly. Protons rarely decay, but are expected to decay.

 

[Denny Crane]

That's not proof. LOL

Hint: Your link talks about the sun, not the Big Bang. Haha

That's photons bumping into each other today. You asked and got a correct answer.

If they bump into each other today, why wouldn't they back then when everything was really compact and you had billions x billions of suns' worth of photons in a small area?

 

[PapaG]

That's photons bumping into each other today. You asked and got a correct answer.

If they bump into each other today, why wouldn't they back then when everything was really compact and you had billions x billions of suns' worth of photons in a small area?

Again, prove it.

 

[Denny Crane]

The proof is mathematical. Perhaps over your head because you don't understand it?

http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/980414a.html

 

[Denny Crane]

And more:

http://en.wikipedia.org/wiki/Matter_creation