Can we see something 47 billion light years away today?

We can't see 47 billion light-years away. 47 billion light-years is not an accurate number, and I don't know when it will become mainstream in Zhihu. At the very least, 47 billion light-years is the co-moving distance.

This means that the time of those galaxies is also 13.8 billion years away from the big **, but in fact, those galaxies are not long away from the big ** now, because their time is different from ours. The conclusion of 46 billion light-years does not calculate that the radius of the universe in the optical path is 13.8 billion light-years.

On pages 155-158 of Brian Green's "Hidden Realities - What Are Parallel Universes?", this question is specifically stated to make it clear that after the light flies, the space before and after him is also rising, and the length of the trajectory traveled by the light already includes the expansion of the universe, so we measure the distance of galaxies from the Earth at 13 billion light-years, which is the distance they are from the Earth now, not 13 billion years ago.

Therefore, the size of the observable universe is 13.8 billion light-year radius, not 47 billion light-year radius. <>

One. There is a misconception here, are we really seeing the light of a star 470 light-years away? Scientists just say that the farthest distance we can detect is 47 billion light-years, but there are two distances.

1. The distance between the star and our Earth when it emits this light. 2.The distance between the star and the Earth when we see this light.

In fact, this 47 billion light-years is only the distance between the star and the Earth when we see this light. According to the current scientific calculations, it is completely achievable.

Two. It is impossible to infer how big the universe is now, but it is clear that the universe is expanding significantly faster than the speed of light. At least at the beginning of the big ** is greater than the speed of light (provided that the theory of the universe is correct.

But who knows. Just as the ancients speculated on geocentrism. Because technology is constantly advancing, the theory of relativity is not true in all cases.

Just like Newton. <>

It's enough to be able to see the solar system clearly, and it's a bit too humorous for you to rely on fantasy and the laws set by humans themselves to prove what a world is too far away to look like!

5,000 trillion light years = 5,000 trillion meters.

The light-year is a unit of length, which is a unit that measures the distance of light in a cosmic vacuum along a straight line for a year, and is used to measure the space-time distance between celestial bodies, which literally refers to the distance of light traveling in a straight line for a year in the cosmic vacuum, which is 9460730472580800 meters, which is calculated from time and the speed of light.

Light-years are generally used to measure a large distance, such as the distance between the Sun and another star. A light-year is not a unit of time. In astronomy, the parsec is another commonly used unit of distance, 1 parsec = light year.

Principle:

The distances between celestial bodies in the universe are so large that it is much easier to measure in light-years if it is very cumbersome to calculate in kilometers, the most common. The distance traveled by light in a year in a vacuum is called a light-year. The speed of light in a vacuum is about 300,000 kilometers per second, or 3,108 meters per second (the length of the Julian year is about equal to the day, and one light year is a kilometer based on January 1, 2000 (recorded as the standard epoch).

5,000 trillion light-years is 10,000 times the radius of the observable universe (46 billion light-years) and 10,000 times the diameter of the observable universe (92 billion light-years). In other words, 5,000 trillion light-years is equivalent to the total length of the universe as we know it today, about 54,300 side by side.

5000 trillion light years = 9460000000000 kilometers 5000 trillion is a long distance, and I don't know how far it is.

One light-year is equal to about 12 trillion kilometers. In five thousand trillion multiplied by 12 trillion and it comes out.

This distance is astronomical, which is why the unit of length is light years. It doesn't really make much sense to change light years to kilometers, you just need to know that this length is huge.

Light travels 380,000 kilometers in one second, and it takes 8 minutes for light to run from the sun to the earth, so one light year is the distance of light running for a year, how terrifying, 5,000 trillion light years, this is unimaginable.

Traveled a distance of 5,000 trillion years at the speed of light.

A light-year is a unit of distance that represents the distance traveled in a year at the speed of light.

The Milky Way is only 100,000 light-years in diameter.

Concept: The description is far away.

How far: Don't think about it, you won't be able to get there in the next life.

It is impossible for a spacecraft to safely enter a black hole, because the spacecraft will be completely torn apart by the ultra-high distorted gravity of the black hole.

It is estimated that countless are omitted from the bottom and below... I won't be able to get there in my lifetime!

It's only happened 13 billion years.

The age of the universe is only 13.6 billion light-years, and you are too good at thinking about it.

Something that aliens don't dare to think of, you said it.

That's 30000000000000000000000000000000000000000000000000

100 million light-years is equal to a trillion times 93 billion, which is equal to 8798 trillion trillion kilometers.

2. The light year is a unit of length, which is used to measure the distance of light propagating in a straight line for a year in the cosmic vacuum, and is generally used to measure the space-time distance between celestial bodies, which literally refers to the distance traveled by light in a straight line in the cosmic vacuum for a year, which is 9,460,730,472,580,800 meters, which is a unit calculated by time and the speed of light.

This is because the telescope does not see the current situation, but the light that has passed many years and has been seen by the telescope, and if you want to see the scene at that time, it will take many years.

Because the speed of light is limited, with the earth as the center of the circle, through the telescope, you can see many stars and see some scenes in the universe.

Because the world we see is already the world of the past, and the universe is constantly changing.

Astronomical telescopes are able to see very far into outer space, and now the science and technology of astronomical telescopes are very advanced. It can help humans to conduct space monitoring.

Trillions of kilometers. The unit of a light-year is the distance that light travels in a straight line in a cosmic vacuum over a year's time and is 9460730472580800 meters. And 33 light years is 9460730472580800*33, and the distance is trillions of kilometers.

Solution: km).

Answer: 100 million light years and so on are more than kilometers.

1 light-year kilometer, 100 million, and the multiplication exponent of the base power, i.e., 10 bends 8 10 12 10 20

1 trillion = 1,000,000

30 trillion = 30 * 10000 * 100000000 = 3 * 10 13300 trillion = 300 * 1000000 = 3 * 10 830 trillion light is 100,000 times farther than 300 trillion light years. If 300 trillion years of light is the size of your palm, then 30 trillion years of light is the size of the Himalayan Slippery Mountain.

1 light year = kilometer.

So 4 billion light early the year before =

Your Manchurian Qingyi is the best encouragement for the answerer.