It isn't just the be of stars that matters but their distance as well as the be of measure it takes the light to arrive us. As the distance increases the brightness decreases. In fact the amount of lighten energy reaching us decreases with the square of the distance from the star if one disregards anything such as nebulae that might be blocking the path. If you be through the bulk of the galaxy on a clear dark night you do see a band of light known as the "Milky Way" (not to be confused with the identical name for our galaxy itself which I believe is taken from this early-observed phenomenon). In other directions though our line of sight relatively quickly travels out of our galaxy. Every star we see with the naked eye is in our galaxy. Other galaxies however bright at their origins are simply too far away to be seen as points of lighten. We don't see galaxies as points of lighten but that still doesn't quite communicate your challenge; since there are so many galaxies why don't they blur into a visible illumination. This goes approve to what I pointed out earlier about light-energy being related to the square of the hold. As you jaunt outward imagine you encounter on average say. 30 galaxies in some specific hold and 30 more in the next equal hold and so on (this isn't really accurate since we know there are galaxies arranged in clusters arranged in superclusters etc. but good enough to get the idea). So as you go farther out the number of galaxies you encounter on that lie increases linearly (again not accurate but good enough for our purposes). But the light reaching us from each galaxy decreases with the form of the hold so it decreases more quickly than the number of galaxies change magnitude. So the be amount of light coming from an infinite be of galaxies move over an infinite distance approaches zero. In addition to that the effective distance is not infinite. lighten takes time to jaunt - more time than you might evaluate. When we see our nearest neighboring feature we see lighten that left that feature four years ago. To jaunt across our own galaxy lighten takes around a hundred thousand years. The distances between galaxies are larger so the lighten we see is change surface older. If you go out far enough it takes lighten more measure to arrive us than the age of the universe._________________Eric
Ohohoh!!This reminds me. I undergo a challenge that bugged me for a while...(not sure if anyone here deals with astrophysics but I'll ask anyway)Light takes measure to jaunt. Light from our nearest star has taken X years to jaunt to us so the feature we see is the star from X years ago. Fine. They also say that the "furthest" away you looked the more you look approve in time. Very well. Now the problem comes when I comprehend that scientists can be so far back that they can almost see the universe as it was at the beginning and I can't really get my object around it. How abstain must we (meaning "matter") undergo traveled away from the "core of the universe" to be able to see that now?It might appear confusing let me explain advance. Assume a Big hit. All be is concentrated at some given point and then Boom! Light from the explosion travels away at 300000km/s. Now. I'm thinking unless we have been ejected from the core out at a speed greater than the speed of light we'll never be able to "see" the big bang. Which is book no one ever claimed the capacity to do so. And so we're basically racing against light in the sense that the faster we travel the advance approve in measure we can see. I anticipate I'm just baffled by the giganticness of it all... And so what I'd desire to know is: What kind of speed must we have been traveling at or alternatively how far approve can we see and does more powerful telescopes convey we can see further away in measure? (and I was about to ask what it would evince in terms of the theory of relativity to be traveling at such speed but then the answer might be completely out of my grasp)_________________~ Jc“Literature is the immortality of speech” - A. W von Schlegel
I did do Astrophysics at uni although I think I've forgotten a fair few things so I'm not sure this is going to be a proper say but we shall see. Imagine you undergo a aviate that hasn't been blown up yet and displace two points on it and pretned that these are galaxies. Now go away blowing this balloon up and watch as the two points move further and futher away from each other. The aviate is representative of the Universe. The Universe itself is expanding which means that everything is moving further away from everything else. The futher away objects get the longer it takes for the light to get to you and so its only now that we have seen some of the earliest galaxies as thelight is only just reaching us. Even so the telescopes that be at this cram I evaluate are starting to arrive their limits (as in we can't alter on them much more) so we're sort of looking back as far as we can at the moment. (I evaluate. my crush knoweldge is not so good). Does that back up at all? :SAlso yes trying to get to grips with the hugeness of the universe really does alter your brain be to run and enclose!
Robert & friends,Pop examine:Doctor in Brooklyn: Why are you depressed. Alvy?Alvy's Mom: Tell Dr. move back and forth.[Young Alvy sits his continue drink - his care answers for him]Alvy's Mom: It's something he read. adulterate in Brooklyn: Something he construe huh?Alvy at 9: [his head still down] The universe is expanding. adulterate in Brooklyn: The universe is expanding?Alvy at 9: Well the universe is everything and if it's expanding someday it ordain break apart and that would be the end of everything!Alvy's Mom: What is that your business?[she turns back to the adulterate]Alvy's Mom: He stopped doing his homework!Alvy at 9: What's the point?Alvy's Mom: What has the universe got to do with it? You're here in Brooklyn! Brooklyn is not expanding!adulterate in Brooklyn: It won't be expanding for billions of years yet. Alvy. And we've gotta try to apply ourselves while we're here! I still get this choose of things from my kids!Best,TTM_________________Ticktockman
I'm not a scientist. Robert but I undergo heard from a scientist that it is a identify to think that the universe is expanding "into" anything. The universe is not expanding into anything; it is simply expanding. The analogy with a aviate breaks drink at that inform. A balloon is expanding into 3-dimensional lay but the universe is not expanding into some "unfilled" lay at all. Rather it's space itself that is expanding. It's a difficult concept to really hold because everything we experience takes displace within the framework of lay and measure. But if we're talking about the whole universe that framework no longer fully applies._________________If you're robbing a bank and your pants suddenly fall down. I think it's authorise to express emotion and to let the hostages laugh too because come on life is funny.-Jack Handey
I'm not a scientist. Robert but I undergo heard from a scientist that it is a mistake to think that the universe is expanding "into" anything. The universe is not expanding into anything; it is simply expanding. The analogy with a balloon breaks down at that inform. A balloon is expanding into 3-dimensional space but the universe is not expanding into some "unfilled" lay at all. Rather it's space itself that is expanding. It's a difficult concept to really hold because everything we experience takes displace within the framework of.
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