Hundreds of thousands of light years, billions of light years, how to measure it

Then we look at the past from this side, that is, the light will pass on.

I don't understand that.

Isn't the reason why people can see things because their eyes receive light?

A light-year is calculated by time and velocity, and the distance traveled by light in a year is called "one light-year". One light-year is about 9,460 billion kilometers.

A parsec is equal to a light-year; One light-year is equal to 63,240 astronomical units.

Astronomers classify the objects to be measured into several grades according to their distance. Astronomers measure the distance of celestial objects that are closer to us, no more than 100 light-years (1 light-year kilometer) away from us. The trigonometric parallax method is to put the measured celestial body at the apex of a large triangle, and the two ends of the diameter of the Earth's orbit around the sun are the other two vertices of the triangle.

Measurements of hundreds of light years, such as analyzing the spectrum of the star, calculating the Doppler effect, calculating the speed of the star's motion, and then using trigonometry to calculate it based on the comparison of other stars.

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

Hello, generally speaking, a star within 100 light years can be used as a background of a root star, and take a picture of it in the winter and another in the summer. The distance between the earth in winter and summer is the radius of the earth's revolution. Using two more angles, you can calculate it with triangulation, and I hope it can help you.

The light-year is actually a relatively large unit of distance, which is generally used to describe the distance between stars, and is generally measured using a laser displacement sensor.

The speed of light is 300,000 kilometers in one second, and one light-year is the time it takes for light to travel for a year, and the time of a year, multiplied by 300,000 kilometers, you can get how many kilometers the light has traveled in a year, and a few hundred light-years is the time to find hundreds of years, which is not real data, but approximately.

The meaning of light year, that is, the light in a year, the distance traveled, this hundreds of light years, that is, this light is the light of a place hundreds of years ago, after hundreds of years, arrived at this place, this is a few hundred light years, should be to find out how many years ago this light was?

Astronomers use trigonometric parallax, spectroscopic parallax, cluster parallax, statistical parallax, Cepheid parallax, and mechanical parallax to determine the distance of a star from us.

We need to be clear about the basic physical concept that a light-year is not a unit of time but a unit of length. This unit is not currently measurable, but is used to indicate that this is a particularly long distance.

In life, we generally use a ruler to measure the distance, if it is a little farther, like the distance between the earth and the moon, you can use electromagnetic wave reflection to measure, but those distant celestial bodies that are tens of thousands of light-years or even hundreds of millions of light-years cannot also be measured by electromagnetic waves, because it will take tens of thousands or even hundreds of millions of years when it is reflected back, so how do scientists measure it, and it is so accurate.

First of all, before we ask the above question, we need to know an important law: the Doppler effect. The Doppler effect is that in front of the moving wave source, the wave is compressed, the wavelength becomes shorter, and the frequency becomes higher. When behind a moving wave source, the opposite effect is produced.

The wavelength becomes longer and the frequency becomes lower; The higher the velocity of the wave source, the greater the effect.

Since light is also a wave, in the visible light band emitted by stars, if the star is far away from us, the color of the light emitted will be red. If the star is close to us, the color of the light emitted will be blue. According to the degree of red (blue) shift of the wave, the speed of the wave source in the direction of observation can be calculated. Depending on the color of the light emitted by the star, we can perform a spectral analysis using the spectroscopic disparity method.

The spectropar method uses the linear empirical relationship between the intensity ratio of certain spectral lines in the stellar spectrum and the absolute magnitude, that is, the absolute magnitude is obtained by measuring the intensity ratio of some spectral line pairs, and then the distance D is obtained from the distance modulus formula mv mv = 5lgd 5. But if it's a celestial body that's relatively close to Earth (less than 1 million years old), another of the most remarkable methods is needed: trigonometric parallax.

Trigonometric parallax is a method of determining distance using the disparity of different viewpoints to the same object. For the same object, observe at two points separately, the line between the two lines of sight and the two points can form an isosceles triangle, according to the size of the top angle of the triangle, you can know the height of the triangle, that is, the distance between the object and the observer. Thus, according to the trigonometric disparity method and the spectroscopic disparity method, the distance of various celestial bodies in the universe can be easily measured.

6 billion light-years is the method used by astronomers to determine the distance between stars and us using trigonometric parallax, spectroscopic parallax, cluster parallax, statistical parallax, Cepheid parallax and mechanical parallax. The determination of stellar distance is of great significance for studying the spatial position of stars and finding the luminosity and velocity of stars.

Measuring the distance between celestial bodies is not an easy task. Astronomers classify the objects to be measured into several grades according to their distance. Astronomers measure the distance of celestial bodies that are closer to us, no more than 100 light-years (1 light-year kilometer) away from us.

The trigonometric parallax method is to put the measured celestial body at the apex of a large triangle, and the two ends of the diameter of the Earth's orbit around the sun are the other two vertices of the triangle. A slightly farther celestial body cannot be measured by trigonometric parallax to measure its distance from the Earth, because it is no longer possible to accurately measure their parallax on Earth.

Generally speaking, a star within 100 light-years can be taken in the background of a star at the root, and a picture of it in the winter and another in the summer. The distance between the earth in winter and summer is the radius of the earth's revolution. Using two more angles, it can be calculated using triangulation.

As for the 100 light-years away, because the apex angle is too small, there are many other measurement methods, such as first analyzing the spectrum of this star, calculating the Doppler effect, calculating the speed of the star's motion, and then using trigonometry to calculate it according to the comparison of other stars.

Hello, it is a pleasure to serve you and give you the following answer: 12 million light hours is about a light year. Causes of the problem:

A light-year is a unit of measurement of distance, which represents the distance traveled by light in a vacuum at a speed of 300,000 kilometers per second for a year. Whereas, light hour is a unit of measurement of time, which represents the distance traveled by light in a vacuum at a speed of 300,000 kilometers per second for one second. Workaround and Procedure Steps:

1.First, to calculate the distance of 12 million light hours, you can use the speed of light formula: distance = speed of light time, where the speed of light is 300000 kilometers per second and the time is 12 million seconds, so the distance is 36000000000 kilometers.

2.Then, to convert 3600000000 km to light years, you can use the formula light years: light years = distance , where the distance is 3600000000 km, so light years are approximately equal to.

Personal tip: Light-years and light-hours are two different units of distance and time, and if you want to correctly calculate the conversion between them, you must master the formula of the speed of light and the formula of the light-year.

13700000000 light years

13.7 billion light-years equals 13700000000 light-years.

A light-year, a unit of length, is generally used to measure the distance between celestial bodies. Literally, it means that light travels in a straight line in a cosmic state in a vacuum with a sail time of one year, which is 9,460'7304'7258'0800 meters.

Because the astronomical data is too large, larger units are needed for a rough rolling description.

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