Scale of the Universe

[ema]

I don't buy into the whole universe is expanding thing quite yet.

It seems to me that the evidence(that light from other galaxies is red shifted)could be explained by other phenomena that do not require dark energy. For instance, a red shift can be produced when light passes through certain gasses. Dark energy is a tough pill to swallow which is why I will keep an open mind towards alternative theories that may explain a redshift in the cosmos.

I'm not much knowledgeable about the things that above the basics. Dark matter, quantum physics, string theories etc...

I am not saying that the universe isn't expanding I am simply saying that it might not be.

I see what you are saying and I agree.

 

[♪alt13]

Dark Matter and Dark Energy(as their names suggest) are two separate things.

Dark Matter is matter that we cannot directly detect.

Dark Energy is the force(we don't know what it is or if it truly exists) that is causing the expansion of the universe.

I think if one can mentally engineer an invisible force that would expand the whole of the universe, than one may just as easily imagine a force that would have an affect on the frequency of light.

 

[ema]

Dark Matter and Dark Energy(as their names suggest) are two separate things.

Dark Matter is matter that we cannot directly detect.

Dark Energy is the force(we don't know what it is or if it truly exists) that is causing the expansion of the universe.

Obviously I know that I didn't refer to dark energy.

I think if one can mentally engineer an invisible force that would expand the whole of the universe, than one may just as easily imagine a force that would have an affect on the frequency of light.

But it's not the doppler effect itself that suggest the expansion. It's the results of calculations based on the effect. It's all basic cosmological distance measurement. Since there is no doubt on cosmological distance measurements because it is consistently accurate for god knows how long, then why not trust it. (with that open mindedness though)

https://en.wikipedia.org/wiki/Expan..._and_how_does_the_rate_of_expansion_change.3F

 

[♪alt13]

But it's not the doppler effect itself that suggest the expansion. It's the results of calculations based on the effect. It's all basic cosmological distance measurement. Since there is no doubt on cosmological distance measurements because it is consistently accurate for god knows how long, then why not trust it. (with that open mindedness though)

https://en.wikipedia.org/wiki/Expan..._and_how_does_the_rate_of_expansion_change.3F

However, the only locally visible effect of the accelerating expansion is the disappearance (by runaway redshift) of distant galaxies;

^From the article you linked to.

I'm not at all confident that I am right, just not entirely convinced.

 

[LogGrad98]

Ahh, more shiverings! The universe is amazing.

Though I generally prefer some baklava or sütlaç(rice pudding) afterwards.

I could just eat doner kebab breakfast lunch and dinner, including desert.

 

[LogGrad98]

So if it all really did start from a singularity, that would imply a fixed point of initial expansion, so there technically should be a center of it all, right? If there really is infinite distance and everything is moving away from everything else at a more or less consistent relative speed, then how could it all have started from a singularity? Seems contradictory.

I predict that our resident physicist will comment on this, and the doner kebab part.

 

[ema]

^From the article you linked to.

I'm not at all confident that I am right, just not entirely convinced.

However, the only locally visible effect of the accelerating expansion is the disappearance (by runaway redshift) of distant galaxies;

That's about "accelerating expansion" not the expansion. It's somewhat controversial already, some say the expansion rate is increasing so the universe is gonna continue to expand forever, some say the expansion isn't accelerating so the expansion won't be forever.

 

[ema]

So if it all really did start from a singularity, that would imply a fixed point of initial expansion, so there technically should be a center of it all, right? If there really is infinite distance and everything is moving away from everything else at a more or less consistent relative speed, then how could it all have started from a singularity? Seems contradictory.

I predict that our resident physicist will comment on this, and the doner kebab part.

It might be about standpoint actually, the guy in the previous video says every point in the universe is the center, a dude from NASA in this video says that there is no a center in the universe.

https://www.youtube.com/watch?v=i1UC6HpxY28

 

[ema]

So if it all really did start from a singularity, that would imply a fixed point of initial expansion, so there technically should be a center of it all, right? If there really is infinite distance and everything is moving away from everything else at a more or less consistent relative speed, then how could it all have started from a singularity? Seems contradictory.

I predict that our resident physicist will comment on this, and the doner kebab part.

By the way singularity is vague. Can you tell me how many real numbers are there between 0 and 10? And how many between 0 and 1?

Yep, both infinite.

 

[addictionary]

Thanks heyhey.

Here is a nice video I watched just a few days ago that eventually triggered this thread because I too went lost on youtube for a science binge.

It's about Al Jefferson, I mean, black holes. What would it be like to travel inside a black hole? It also refers to the center of the universe topic I mentioned earlier in this thread.

https://www.youtube.com/watch?v=3pAnRKD4raY

LoL I would laugh so hard if Al's face popped in the middle of a documentary about black holes produced by an angry Jazz fan.

 

[Harambe]

When you look at it like this, hurt feelings on the internet just don't really matter.

 

[TroutBum]

When you look at it like this, hurt feelings on the internet just don't really matter.

I had mom-sex with your dad, jerk face turd knuckle~!

 

[♪alt13]

That's about "accelerating expansion" not the expansion. It's somewhat controversial already, some say the expansion rate is increasing so the universe is gonna continue to expand forever, some say the expansion isn't accelerating so the expansion won't be forever.

You're right. I misspoke.

I should have clarified that I am not so far out there as to believe in a steady state universe. I don't buy into an accelerating expansion just yet.

^what I meant to say.

 

[ema]

You're right. I misspoke.

I should have clarified that I am not so far out there as to believe in a steady state universe. I don't buy into an accelerating expansion just yet.

^what I meant to say.

Not a bad thing, being cautious or skeptical. There are too many things we don't know about the universe.

It's an another interesting scenario btw, if as you doubt, the accelerating expansion isn't the truth. For instance, one scenario asserts the end of the expansion at some point and a conversely shrinkage of the universe until just another big bang. Of course, the time frame for this scenario is unimaginable, billions of years or maybe even trillions.

 

[LogGrad98]

Not a bad thing, being cautious or skeptical. There are too many things we don't know about the universe.

It's an another interesting scenario btw, if as you doubt, the accelerating expansion isn't the truth. For instance, one scenario asserts the end of the expansion at some point and a conversely shrinkage of the universe until just another big bang. Of course, the time frame for this scenario is unimaginable, billions of years or maybe even trillions.

If ever actually. The stuff we don't know about all this so far outweighs what we do know that it is staggering. If the sum of the knowledge about the way the universe works were calculus, let's say, then we barely know how to add and subtract and get that wrong half the time.