How many stars are there in the universe? How many stars are there in the universe

If there are some people you don't know, just like the stars, how do you know the names, I'll only list the ones you know: the planets in the universe can't be calculated systematically, they can only be estimated. Because at present, we can only see the farthest distance of 130-20 billion light years, and according to the current observation of our human beings, there are about 1,300 galaxies like the Milky Way, and our Milky Way is only an ordinary galaxy of medium mass.

How many planets are there in the universe? No one can give a specific answer to this question yet, because the scope of what our technology can observe is very limited. There are about 300 billion stars in our galaxy with a diameter of 100,000 light years, and as for how many planets there are, the current astronomical statistics technology has not been able to accurately count them, because they also include planets, asteroids, comets and other natural objects.

There are still many more stars around planets, and there are still many unknowns on the question. All the bright stars that can be seen with the naked eye on the earth are basically the stars of our galaxy and the six planets in the solar system, and there are about 3,000 stars that can be seen in the entire celestial sphere. The clear night sky is full of stars, but the eyes are actually deceiving themselves, because there is no other reference in the night sky except stars and stars.

To put it bluntly, the overlapping phenomenon of the starry sky deceives the eyeballs. There are currently more than 6,000 named stars (planets, asteroids, comets, etc.), including some stars in extragalactic galaxies. For example, the more famous stars in the Milky Way:

Sirius, Proxima Centauri, etc. The more famous galaxies outside the river are: Cowherd, Vega, M16, etc., and asteroids such as Ceres, Zhonghua 1 asteroid, etc.

Comets include Halley's Comet, Shoemaker-Levy 9 (series) Comet, and many more. Because there are thousands of names that have been named, it is impossible to list them all here. If you have time to go to the relevant astronomy** to see, I believe you will have a lot of gains.

There is one in total, and the name is"Stars".

How much sand there is in the desert How many stars there are in the universe I won't talk nonsense, but I hate to ask nonsense questions.

Trivia: How many stars are there in the universe?

6973 are visible to the naked eye.

There are two main factors that determine whether people observe the stars as light or dark:

One is due to the size of the star's ability to emit light, and the other is the distance between the star and people.

Astronomers usually divide the ability of stars to shine into 25 magnitudes, with the strongest ones being about 10 billion times different from the worst ones.

The brightness of a star is often expressed in terms of magnitude. The brighter the star, the smaller the magnitude. The magnitude measured on Earth is called the apparent magnitude; A magnitude that is attributed to a distance of 10 parsecs from the Earth is called an absolute magnitude.

The magnitude of the same star measured by detection elements that are sensitive to different wavelength bands is generally not equal. One of the most versatile magnitude systems is the U (ultraviolet), B (blue), and V (yellow) trichromatic systems (see Photometric Systems'"

class=link> metering system); b and v are close to photographic and visual magnitudes, respectively. The difference between the two is the commonly used color index. The Sun is of v=equal, the absolute visual magnitude is m=+, the chromatic index is b-v=, u-b=.

The color temperature can be determined by the color index.

A star that is close to people has a strong ability to emit light, so people will light up when they see it. However, even if a star is quite capable of emitting light, if it is very far away, then its brightness may not be as bright as that of a star that is tens of thousands of times less capable of emitting light.

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People always say that there are too many stars in the sky, but in fact, all the stars that can be seen with the naked eye can still be counted. Astronomers divide the stars in the sky into 88 constellations according to their regions. Among them, the northern sky (bounded by the celestial equator) has 29 constellations; There are 46 constellations in the southern sky and 13 constellations in the north and south of the celestial equator.

As long as we have patience and count the stars in one constellation, we can count the stars that can be seen with the naked eye. According to the calculations of astronomers: 6 stars of magnitude 0; 14 stars of 1st magnitude; 46 stars of 2nd magnitude; 134 stars of 3rd magnitude; 458 stars of 4th magnitude; 1476 stars of 5th magnitude; 4,840 ...... of 6th magnitudeNo more than 7,000 in total.

If we use a telescope, the situation is different, and even with a small astronomical telescope, more than 50,000 stars can be seen. The largest modern astronomical telescope can see more than 1 billion stars. In fact, the number of stars in the sky is much more than that.

The universe is endless, and what modern astronomers see is nothing more than a tiny, tiny part of the universe.

About 3 American Yale astronomer Peter. Fan. Dokun and Charlie, an astrophysicist at Harvard University. Conroy analyzed the intensity of light from galaxies and concluded that there were far more red dwarfs in galaxies than previously thought.

Previously, astronomers estimated that the number of stars in galaxies was about a trillion times that of 100 billion.

Fan. After observing distant galaxies in Hawaii with the help of electron astronomical telescopes, Dokun and his team found that the stars of these distant galaxies were many times or even dozens of times larger than previously thought, and that the size of 3 was followed by 23 zeros. For the sake of the image, Conroy said that there are about 50 trillion human cells in each person and about 6 billion people on the earth, and the product of the two is exactly 3 followed by 23 zeros.

In other words, the stars in the sky are comparable to the total number of human cells on earth. With the development of science and technology, more and more celestial bodies have been discovered by humans.

20 trillion 40 trillion billion.

The number of stars in the universe is calculated based on the number of stars in the Milky Way. With current technology, we can't see every star in the Milky Way. The visible light telescope can observe stars within a radius of 5,000 light-years with the Sun as the center, while the radius of the Milky Way is 560,000 light-years, the Sun is about 10,000 light-years from the center of the Milky Way, and the farthest galaxy star is 90,000 light-years from the Sun.

According to current extrapolation, there are about 400 billion stars in the Milky Way, with a plus/minus error of 50%, so the number of stars in the Milky Way is 200 billion 600 billion.

There are 100 billion 200 billion galaxies like the Milky Way in the universe. If the number of stars in the Milky Way is calculated at a minimum of 200 billion, the number of stars in the universe is 2 1022 4 1022, or 20 trillion 40 trillion billion.

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Planets** in turn give rise to stars.

It is estimated that there are 2000 galaxies in the universe.

The Milky Way is a medium-sized galaxy, there are 200 billion stars in the Milky Way, and if you calculate it this way, there are 4*10 stars to the 22nd power in the universe.

This is just an estimate and may be an order of magnitude or two short, but at least it shows that there are very many stars in the universe.

There are as many stars in the sky as cow's hair, and they are innumerable.

Because the universe is infinitely large, there are infinitely many stars in the universe, of which more than 6,000 are visible to the naked eye.

Trivia: How many stars are there in the universe?

In fact, you know best how many stars you have, you can count as many as you want, not too many, not too many. The key depends on how many you count.