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

The number of stars in the universe is calculated based on the number of stars in the Milky Way.

The number of stars in the universe is 2 1022 4 1022, which is 20 trillion 40 trillion billion. Hehe.

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.

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.

More stars can be seen with a telescope, and the larger the aperture of the telescope, the more stars you can see. For example, 40,000 stars can be seen with a 3-centimeter telescope and 3 billion with a 5-meter telescope. However, there are so many stars in the universe, there are 200 billion in the Milky Way alone, so no matter how large the aperture of the telescope, it is impossible to figure out how many stars there are in the universe.

In fact, the number of stars in the sky is much more than that. The universe has not yet been discovered, and what modern astronomers see is nothing more than a part of the universe.

How many grains of sand are there in the Sahara...

It is often said that the sky is full of stars. How many stars are there in the sky? The 1st issue of the journal Nature gives the answer: about 3 followed by 23 zeros. For those who like to look up at the stars, counting the stars will be a lot of work.

Peter Van Dowkun, an astronomer at Yale University in the United States, and Charlie Conroy, an astrophysicist at Harvard University, analyzed the intensity of light from galaxies and concluded that the number of galactic red dwarfs was far greater than previously thought.

Previously, astronomers estimated that the number of stars in galaxies was about a trillion times that of 100 billion. This theory of hail ignition is based on the work of Carl Sagan, an astronomer at Cornell University in the United States. Sagan once wrote a best-selling book called "100 Billion Letters."

He believes that there are 100 billion galaxies in the universe, and each galaxy has 100 billion stellar bodies.

After observing distant galaxies in Hawaii with the help of electron telescopes, Van Dokun and his team found that the stars of these distant galaxies were many times or even dozens of times larger than previously thought. "We see 10 to 20 times as many red dwarfs as we do," Van Dokun said. Conroy said that 3 is followed by 23 zeros, which is an astronomical number even for astronomers who calculate distances in light years.

To illustrate the size of the number 23 zeros after 3, Conroy said that each person has about 50 trillion human cells, and there are about 6 billion people on the earth, and the product of the two is exactly 23 zeros after 3. In other words, the stars in the sky are comparable to the total number of human cells on earth.

In addition, Van Dokun and Conroy found that only one-third of galaxies are elliptical like the Milky Way.

Cannot be counted. If you need specific numbers: no answer. Humanity does not see the end of the universe.

If someone else asks you as a witty or weak test: Tell the person asking the question, "Get out of the way."