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What evidence is there that the universe was different in the past?
We observe the universe with our various telescopes. Since light travels at a finite speed, it takes time for any light to travel from an object (say, a galaxy), to your telescope. Therefore, for any distant object, you are not seeing the object as it appears now, but as it appeared when the light left it.For very distant objects this can be billions of years, and further back in time you look, the more different the universe appears. Beyond about 13 billion years, there are no galaxies, for example.
What is One Trillion Light Years away from Earth?
One trillion light years away from Earth would be an extremely distant region in the Universe, likely beyond the observable Universe. The vastness of such a distance makes it difficult to comprehend, but it would likely be in a remote part of space where galaxies and other cosmic structures are spread far apart.
Are quasars part of your solar system?
No, quasars are not part of the solar system. Quasars are extremely distant and energetic objects located in the far reaches of the universe, millions or billions of light years away from our solar system. They are powered by supermassive black holes at the centers of galaxies.
Scientist believe that the more distant galaxies are formed when?
Far or near, all galaxies were thought to be formed in the first half billion years of the formation of the universe ... that is, about 13 billion years ago. Note that we're seeing the distant ones in a younger stage of development.
Why is light years used as a unit of the universe?
Because the universe is so large, they need something like light to at least reach large amounts of distance.
The most distant objects seen in the universe are how far from us?
13 billion light years (rounded)
Why do scientist study distant galaxies to learn about early galaxy's?
If you look at a distant galaxy, the light from the galaxy has travelled for perhaps a hundred million years, a billion years, or up to an age close to the age of the Universe (13 billion years or so), depending on the galaxy's distance. Thus, the light you see shows you how the Universe was billions of years ago.
What part of universe contains information about past?
The distant universe is seen as it was when the light we see now left it, this is as much as 13 to 15 billion years ago.
How much big is the universe?
It is not currently known how big the Universe is. The observable Universe has a radius of about 47 billion light-years; that is, the most distant objects that can be observed in theory are at that distance. The actual Universe is probably quite a bit bigger.
Whats the biggest struture in the universe?
Astronomers have found a mind-bogglingly large structure so big it takes light 10 billion years to traverse in a distant part of the universe.
What is The amount of time it takes light from the most distant stars to reach earth?
The most distant stars we can see (at least in principle) now are almost as old as the Universe; so, about 13 billion years.
What evidence is there that the universe was different in the past?
We observe the universe with our various telescopes. Since light travels at a finite speed, it takes time for any light to travel from an object (say, a galaxy), to your telescope. Therefore, for any distant object, you are not seeing the object as it appears now, but as it appeared when the light left it.For very distant objects this can be billions of years, and further back in time you look, the more different the universe appears. Beyond about 13 billion years, there are no galaxies, for example.
How can the universe be 156 billion years in diameter if it is only 14 billion light years old?
The diameter must be expressed in a unit of distance/length - for example in light-years - NOT in years. The answer is that the distant parts of the Universe are going away from us, faster than the speed of light. Inside its own local space, nothing can move faster than the speed of light. But in the case of the expansion of the Universe, you might say that space itself is expanding. This makes it possible for objects to move away from us faster than light.
How can you be sure that the universe is expanding still if the light you are measuring to conclude this is many billions of light years old?
An important reason for believing that the Universe is expanding is the redshift of light from distant galaxies. This is usually attributed to the Doppler effect - the frequencey of a wave changes if the object emitting the waves moves towards you, or away from you.
How does the fact that light can travel through a vacuum impact our understanding of the universe?
The ability of light to travel through a vacuum allows us to observe distant objects in space and gather information about the universe. This has greatly expanded our understanding of the cosmos, as we can study objects that are millions or even billions of light-years away.
How far is the most distant object in universe?
Astronomers have spotted the most distant object yet confirmed in the universe - a self-destructing star that exploded 13.1 billion light years from Earth. It detonated just 630 million years after the big bang, around the end of the cosmic "dark ages", when the first stars and galaxies were lighting up space.
What is One Trillion Light Years away from Earth?
One trillion light years away from Earth would be an extremely distant region in the Universe, likely beyond the observable Universe. The vastness of such a distance makes it difficult to comprehend, but it would likely be in a remote part of space where galaxies and other cosmic structures are spread far apart.
