How many light years is the cosmic microwave background from Earth?

1, since it is the background, it is everywhere, 0 light years from the earth.

2. The maximum redshift of a redshift star measured so far is , that is, it is moving away from us at a speed of 10,000 kilometers per second.

However, I have a question with you**, for example, the redshift of the above star is measured based on the light that reaches the earth now, but this starlight is, for example, emitted 10 billion years ago, then this is only its speed 10 billion years ago. We all rely on the speed measured by starlight hundreds of millions, billions, and tens of billions of years ago, how can it be said that it is "the current expansion rate of the universe"? Even if the universe shrinks now, the light has not yet reached us, and we don't know it.

4. The energy of gamma-ray bursts is very high, and the energy released can even be compared with the universe.

The gamma-ray burst that occurred on December 14, 1997, was 12 billion light-years away from Earth, releasing energy hundreds of times greater than that of a supernova explosion, and the gamma-ray energy released in 50 seconds was equivalent to the total radiation energy of the entire Milky Way in 200 years. This gamma-ray burst is as bright as the entire universe outside of it for a second or two. Within a few hundred kilometers of its vicinity, the high temperature and high density of the universe at the last thousandth of a second are reproduced.

However, the gamma-ray burst on January 23, 1999, was even more intense than this one, emitting ten times more energy than the 1997 one, making it the most powerful gamma-ray burst known to mankind to date.

1 Q: Cosmic microwaves are everywhere, and the electromagnetic waves emitted by them have never stopped wandering around us, and at this moment, these radiation energy is rapidly passing through our bodies.

2 Q: The current expansion rate of the universe is different in different regions of the universe, and it is completely impossible to calculate accurate values with our current scientific capabilities. The only thing we know is that the expansion of the universe is accelerating under the impetus of dark energy, and one day this expansion will exceed the speed of light.

3 Q: The first thing I need to tell you is that dark matter and dark energy are two completely different things, dark matter is the key to the formation of galaxies, the stars of the galaxy itself do not produce enough gravitational force to gather into groups, and dark matter is like a cage, imprisoning the groups of galaxies within a certain range, under this premise, stars rely on various gravitational forces to form galaxies.

Scientists predict that dark energy will eventually triumph over dark matter, and without the protection of dark matter, galaxies will be disintegrated.

Dark energy cannot destroy black holes, but it can disintegrate galaxies and accelerate the expansion of the universe. One day, the 200 billion stars in the Milky Way galaxy will also be completely dispersed by dark energy, and the structure of our galaxy will also disintegrate.

4 Q: The energy of gamma-ray bursts is very powerful, and from the perspective of pure energy, the energy of gamma-ray bursts is second only to that of the universe. Except for the universe, you will never find any energy source that is stronger than a gamma-ray burst.

The energy of a gamma-ray burst can also be seen in its brightness. Intuitively, the brightness of an ordinary supernova** is equivalent to the sum of the sun's brightness in 10 billion years, and the erupting gamma-ray burst is 100 million times brighter than a supernova, enough to illuminate the entire universe.

If a gamma-ray burst hits the Earth head-on without encountering any obstacles during its flight, it will be enough to instantly heat the Earth to a temperature of hundreds of millions of degrees, and the entire Earth will be vaporized and completely disappeared in an instant. Even if it is just a passing one, it can destroy much of the Earth's atmosphere in a matter of seconds, triggering a mass extinction. The Ordovician mass extinction of the earth was caused by a gamma-ray burst, and its catastrophic effects were enough to last for hundreds of thousands of years.

1) You should be talking about how far away the first light was from the earth.

The main observational evidence in cosmology is cosmic background radiation. Because we know that the universe is expanding, when we push back time, the universe shrinks smaller and smaller, and we will find that the pressure and density of the early universe are very large, and when the pressure density is extremely high, the electrons will be free, just like water turns into water vapor at high temperatures, and light will not be able to move in a straight line when it meets electrons, and will be scattered by electrons. It's like you can't see the person on the other side through water vapor, because the light is scattered by the water vapor.

So the early universe was an opaque universe. It wasn't until about 100,000 years after the age of the universe that the expansion lowered the temperature to about 3,000 degrees Celsius, and the electrons and protons combined to form electrically neutral hydrogen, and light was finally able to move in a straight line. So now we can only see the universe 100,000 years after the universe is big, because before that the universe was opaque.

Because these lights have traveled through the universe for 14 billion years, everything that happened in the universe during these 14 billion years can be known through these lights.

So the answer to the first question is 140 light years!

2) In the past, astronomers could only make a rough estimate of the rate of expansion of the universe, concluding that it was between 50 km/s and 100 km/s, and the new data measured by Friedman et al. is 72 km/s, just in between.

3) Two types of dark matter are already known – neutrinos and black holes. That is, black holes are a type of dark matter, and this question is problematic.

4) It's hard to say how big the energy is, but it can only be said that it is second only to the energy of the universe. The "brightness" of a gamma-ray burst is equivalent to the sum of the "brightness" of all gamma-ray sources throughout the day. The known description is exactly how many times which time is which:

The gamma-ray burst on January 23, 1999, was even more intense than this one, emitting ten times more energy than the 1997 one, making it the most powerful gamma-ray burst known to date.

Hope it works for you!

Relying on reliable theoretical speculation and reasonable phenomena, the farthest distance we humans found when exploring the universe is about 130.1 billion light-years from the Earth, which is actually a UDFY 38135539 galaxy, because astronomers have discovered the farthest galaxy from the Earth so far and named it UDFY 38135539, and the distance between the Milky Way and the Earth has reached 130.1 billion light-years.

Never before, mankind has ever found such a distant galaxy gathering stars, gas and dust, the Milky Way is so far away from the Earth that scientists observed it when it was still in the initial stages of formation, about 6 million years old, which is only equivalent to 4 of its current age, UDFY 38135539, aka HUDF YD3 He is actually the farthest celestial object ever observed by man, and confirmed by spectroscopy since as of October 2010.

This UDFY 38135539 is also located at the base of the Furnace, about 4 billion seconds from Earth, more than 13 billion light-years, and the light red displacement of the galaxy reaches 8 55. In contrast, the rays of the gamma-ray storm GRB090423, the previous record holder for the farthest celestial body, changed red to 8 2, and around April 1999, humans also used deep sky images taken by the Hubble telescope.

Researchers from the State University of New York at Stony Brook have discovered an ancient galaxy 13 billion light-years from Earth near the edge of the universe, the farthest object ever discovered, but it may now go further, but not more than 13.7 billion years old, and the age of the universe is 13.7 billion years, which is naturally well-foundedIt is calculated through a series of physical theories and mathematical methods, such as the expansion of the universe.

The question of how experts can see the farthest distance of the universe at a distance of 96 billion light-years is explained here today.

The latest research suggests that the diameter of the universe can reach 92 billion light-years, and even more. The current observable age of the universe is about 13.8 billion years, which means that the diameter of our universe will be a multiple of 13.8 billion light-years due to the relationship between space-time distance and the speed of light, if it is estimated at 13.8 billion light-years, and taking into account the accelerating expansion of the universe.

Then the visible radius of our universe will reach 46 billion light-years, which means that the diameter of the universe is 92 billion light-years. Of course, some scientists also believe that the universe can no longer be described by numbers, and it needs to rely on the rich imagination of human beings to associate and depict.

Theory

The Great Theory is a modern cosmological description of the evolution of the universe. According to the estimates of this theory, space and time appeared together after the great ** of 100 million years ago, and as the universe expanded, the energy and matter that originally existed became less dense. The initial accelerated expansion is known as the inflationary period, after which the four fundamental forces known separate.

The universe gradually cooled and continued to expand, allowing the first subatomic particles and simple atoms to form. Dark matter gradually accumulates and forms foam-like structures, large-scale fibrous structures and cosmic holes under gravitational pull. Huge clouds of hydrogen and helium molecules were gradually drawn to the densest concentrations of dark matter, forming the first galaxies, stars, planets, and everything.

Do you say that it is the radius of the rolling dust, or the circumference, or the length of the equator Light years, the unit of length, refers to the distance that light travels in a vacuum, it is calculated by time and speed, and the time it takes for light to travel for a year is called "one light year".That's about 9,460 billion kilometers a year. A more formal definition is:

The distance traveled by a photon in free space and at infinity from any gravitational or magnetic field in a Julian year (i.e., a day, and each day is equal to 86,400 seconds). Because the speed of light in a vacuum is 299,792,458 meters per second (accurate), one light-year is equal to 9,460,730,472,580,800 meters. (Or 5,786,101,150,000 miles.)

or 5,108,385,784,330,890 nautical miles or approximately equal to 10 15 m = patials. That's 9454254955488 kilometers (read: 94,54,254,955,488 kilometers) (60 seconds per minute, 24 hours a day, 365 days a year) (Note:

1 km (mile) mile nautical mile) Light-years are usually measured by burying reeds at a large distance, such as the distance between the solar system and another star. A light-year is not a unit of time. It takes about eight minutes for light to reach the Earth from the Sun (i.e. the distance between the Earth and the Sun is eight "light minutes").

The closest star known to the solar system is Proxima centauri, which is light-years away. The galaxy we live in, the Milky Way, is about 70,000 light-years in diameter. Assuming that there is a spaceship with nearly the speed of light to get from one end of the galaxy to the other, it will take more than 100,000 years.

But that's only for a stationary observer (relative to the Milky Way), and the journey felt by the people on board is actually only a few minutes. This is due to the phenomenon of time dilation of a moving clock in a special theory of relativity. At present, the scope of astronomical observations has expanded to a vast space of 20 billion light-years, which is called a total galaxy.

Conversion to other commonly used units in astronomy: One parsec is equal to a light-year. One light-year is equal to 63,240 astronomical units.

In addition, light travels about 300,000 kilometers per second, 18 million kilometers per minute, 108,000 kilometers per hour, 25,92,000 kilometers per day, and 946,08,000 kilometers per year. So the distance per light-year is about: 946080000 kilometers.

Hello, it is my pleasure to serve you and make the following answer for you: Violet Microstar is located at a distance of about light years from Earth. This problem arises due to advances in the measurement of cosmic distances.

The distance between objects in the universe is measured in "light years", one light year is equal to the distance of one year that light travels in the universe, and buried early ash, that is, one light year is equal to trillions of kilometers. Due to the great distance between the Earth and the violet microstar, measuring the exact distance requires high-precision instruments and techniques, such as radio telescopes, telescopes, etc. There are two ways to solve this problem:

1.By observing the starry sky, telescopes and other instruments are used to measure the distance from violet microstars to Earth. 2.

Put the position of the Earth and the position of the violet microstar into a cosmic model, and then use the cosmic model to calculate the distance between them. The steps are as follows:1

Choose a model of the universe, such as the Universe Model. 2.Put the positions of the Earth and the violet microstar into a cosmic model and calculate the distance between them.

3.Use telescopes and other instruments to measure the distance of violet microstars to Earth and check them. 4.

The results obtained by the two methods were compared to confirm the final result. Personal tip: When calculating distances between objects in the universe, be careful to use accurate models of the universe and the latest observation equipment to ensure accurate results.

At the same time, it is important to check the results to ensure that the final result is accurate.