How many stars are there? 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.

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.

First you have to give at least a range.

If it's the Milky Way, look below.

Specific quantities. To be precise, no one knows. Because the universe is infinite. So macroscopically speaking, the number of stars should also be unlimited. You can't talk about quantity. Got it?

Those who say numbers are only approximate estimates. None of them are very credible.

There is no way to calculate how many stars there are, and the question of the number of stars was only announced by Australian astronomers at the International Astronomical Union in 2003 that the entire visible universe is about 700 trillion billion stars. Not to mention the unseen universe that humans have not yet seen and touched.

There are about 700 trillion stars in the visible universe.

The specific number of stars in the universe is simply innumerable, galaxies like the Milky Way contain more than 200 billion stars, not to mention how many large and small galaxies there are in the universe, and how many stars are contained in them. In 2003, at the International Astronomical Union, astronomers said that there are about 700 trillion stars in the entire visible universe.

However, the most famous star for mankind should be the sun in the solar system. The planets in the solar system all revolve around the sun, and the sun moves around the center of the galaxy. About three-quarters of the mass of the sun is hydrogen, and the rest is helium and small parts of oxygen, carbon, iron and other elements, which are emitted by nuclear fusion.

If a celestial body has fuel supplied internally, is massive enough to ignite itself, generates fusion reactions inside, and thus shines and heats, and it has 9% of the volume of the Sun, then we can call it a star.

Not necessarily. There are large and small galaxies, and the number of stars in a galaxy can be as small as possible.

Our own galaxy.

It is a barred spiral galaxy with a huge disk of galaxies, about 30,000 parsecs in diameter.

or 100,000 light-years, or about 3,000 light-years thick; It has about 300 billion stars.

The Great Galaxy of Andromeda.

It is larger than the Milky Way and is the largest galaxy in the group. It has twice the mass of the Milky Way, is at least twice as large as the Milky Way, and contains twice as many stars as the Milky Way.

Most galaxies in the universe are dwarf galaxies, tiny galaxies that are less than one percent the size of the Milky Way and contain only billions of stars.

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."