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Everything in the universe evolved from Big-bang. Yet, often cosmologists report that they have found a galaxy which is 13.8 billion light years from earth and thus they claim that they can study the formation of galaxies when universe is in early stage (universe is 14.4 bn yrs old) by analysing that 13.8 bn yrs far galaxy from earth. How can the light 13.8 bn yrs old reach to us now as everything evolved at a same time from the BIG-BANG ?
The Big Bang has been agreed upon because everything in our universe is accelerating further away from each other.
Therefore if you go back billions of years obviously at some stage everything was in one spot.
Common sense alone tells us this MUST be true.
Generally scientists state that everything started from something as small as the size of a pea. All matter, laws of physics and everything then came from that in a sudden burst (Big Bang) that within a millisecond was a large universe. Science has informed us how this CAN be possible.
Light from a galaxy 13.8 billion light years away, was NOT 13.8 billion light years away when the light was already able to be seen on Earth. It may have only been a few million light years away when light came to us. But due to the continual outward movement of all the galaxies AND because the entire universe itself is also expanding; that galaxy may be 13.8 billion light years away.
Your question is a very common question that has already answered over and over again. These types of facts should really be taught in schools until children fully understand them, ideally before reaching adulthood.
I'm saddened by some of the above posts that still show ignorance about what we KNOW in our universe already. The Big Bang is still the most accepted BEST answer from where all things started. How it started is another question, the latest understanding is through quantum mechanics and string theory.
Does that help? It was just off the top of my head and I'm not going to read back over it, I originally just wanted to be brief :)
Thanx. But how scientists can claim they are seeing now is nothing but a galaxy which was used to be 13.8 bn light yrs away from earth because the light rays emitted from it 13.8 bn light yrs ago reached us now only. It is like a alien say Tom living on that galaxy has taken photos of a galaxy 13.8 bn yrs ago and now Tom has arrived on earth at speed of light, showing photos to us. The existence of that galaxy should be ceased by now, isn't it?
What does it matter whether or not that galaxy still exists now? You are right that it might not exist today, but that's not the point.
The point is that they get to see a galaxy that existed 13.8 billion years ago, and thus better understand what the conditions of the universe were like back then.
That was well said Sog.
When it comes to science you must be very clear with your question Anonymous Poll Creator.
Just simple short clear questions helps enable clear answers.
I'll add one more (wait 2 I just thought of another!) relative points as well.
Its also the time in which has passed.
So now its: Speed of expanding universe (above the speed of light); Speed of galaxies moving further apart; and also the time that has elapsed for light to reach us.
Plus there is a change in time bending around the universe due to gravity.
To answer your question objects gasses etc do not travel at the speed of light although after the big bang they traveled close to the speed of light so they are lagging behind that's why they are 13 trillion light years away and not 14 it is also a fact that the universe is expanding is not a theory what caused it is up for debate but it wasn't caused by a make believe god .
Basically, if you are seeing light from 1 light year away, what you are seeing happened 1 year ago. I saw a super nova. What I saw happened many years ago, not when I saw it, because it took the light that long to reach earth.
As for a gawd existing, that is just wishful dreaming on the part of people who cannot accept the fact that after one dies, there is nothing more.
The universe is just 6000 years old, you ignorant atheist!
I find it funny when atheist scientists claim they can provide an accurate theory about the creation of the universe from it's inception.
Atheists need a reality check. For only GOD is the answer to all questions.
Science has not explained many things and we are constantly discovering we are wrong. I think they can only observe that far away and the universe is much older, of not infinite. Personally I think the big bang theory is not accurate at all and that the universe is cyclic with no specific defined returning point. Also scientists are measuring these things using a 4 dimensional model of the universe, although I believe those laws work much differently in deep space. To give a simplified example I think the universe is shaped like a pac-man game where you just loop around eventually and it is only expanding into itself.
Well 'if' it was cyclic (Big Bang then Big Crunch) then this time around that has stopped!
If you read above, all matter is accelerating away from each other at greater and greater speeds. Its not slowing then reversing, its getting faster and faster moving away.
Its not shaped like a pacman. They (scientists) have already confirmed all the possibilities of all the shapes it can possibly be under all conditions, and it comes down to 3 shapes only. Flat, Open or Closed.
Here's a quick Google on which one they understand it to be:
"We now know that the universe is flat with only a 0.4% margin of error", according to NASA scientists.
The Big Bang (scientific theory, similar to gravity theory) is the BEST most rational intelligently understood MOST likely scenario of how the universe came to be. It is SO accepted that it is now mandatory taught in all schools.
I'm not so convinced that their theories are accurate. Scientists have always later proved themselves wrong. They have only measured the observable universe.
I wouldn't guess it is exactly like a pac-man game either, although that is a dumbed down example of my theory.
My guess is there is not returning point and though it may be cyclic, there is no determined start of end point.
My guess of the shape is that it is multidimensional and appears to be expanding because the expansion is cycling as well. I can picture it but am not sure how to explain it other than it involves dimensional shapes most people don't think about.
The big bang theory fails to explain what happened before the big bang, which had to exist to create the bang in the first place. I could accept there could be many big bangs within a realm outside of our existence.
If nothing existed, something would have to exist to aknowledge the lack of existence, and therefore we exist to observe.
Well Professor Lawrence Krauss wrote a book about “A Universe From Nothing”, he states you can actually obtain something from nothing, well theorizes in an intelligent factual manner (just by the way I've watched as many Lawrence Krauss's youtube vids as possible, he's very fascinating to watch and learn from, he is the Foundation Professor in the School of Earth and Space Exploration, and probably the presently most recognized public speaker on the cosmos).
There is 'another' theory that may allow your infinite loop of our universe and that's the present debates on the multiverse existence which allow things like the laws of physics and even dark energy to exist without mathematical errors.
Your last line was most interesting. Acknowledging we exist to observe.
If you really think about evolution and all the present species, only humans (the observers) are interested in the origins of the universe and observation of it.
It has NOT been conclusively proven why evolution has allowed humans to evolve with this curiosity or ability to observe where and how the universe started. In actual fact, evolution of humans on Earth should not have evolved our brain to ponder the origins of all life and the universe since it has no bearing on human survival on Earth, none! A bit concerning really.
Anyway, scientists have said the 'why' question is not important. Stating there is no purpose in the first place. They also state that the reason 'why' we look to the cosmos to find out everything is because physics and cosmos scientist observers exist :D Of which is meant as a part joke, in part because just NOW in our present universe time happens to be the BEST time ever to observe the universe, whereas in less than a billion years through observing we will know less due to the galaxies moving so far away from us!
"Everything in the universe evolved from Big-bang. "
That's pure speculation and even a good astrophysicist will tell you that. Actually, if you were keeping up to date in the science world, you would know that the theory is getting ripped apart more and more. There are many scientists who now believe there was never in fact a big bang and that the universe always was and that there was never a point in which the universe began.