Are there 7 billion stars in the sky?

It depends on what you say. But 7 billion is much more.

On a sunny night, when the air is transparent and there is no background light, only about 5,000 to 6,000 stars can be seen with the naked eye. With the help of a telescope, you can see much more stars.

The stars we usually refer to, except for a few planets, are stars in the Milky Way galaxy and a few faint nebulae. But the exact number of stars in the Milky Way galaxy is unknown. It is said that there are about 2000 300 billion of them.

Most of the nebulae seen with the help of telescopes are galaxies outside the Milky Way. Some of these galaxies are smaller than the Milky Way and some are larger than the Milky Way. Our Milky Way galaxy can only be considered a medium-sized galaxy.

And there are 2000 300 billion stars in medium-sized galaxies, so how many galaxies are there in the universe? Scientists say that there are no less than 200 billion galaxies in our observable universe.

Multiply it by 250 billion stars in each galaxy, which is one, and multiply it by 200 billion (2 10 11) to get 5 10 22 stars.

Usually when we talk about stars, we mean stars. If you add to this the planets that don't shine and can't be seen, then no one knows how many.

About 3 behind 23 zero seeds of Yale University 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.

So, there are more than 7 billion stars.

Hope it helps. According to.

The stars in the sky are the light emitted by distant stars, just like the sun, but the sun is closer to us, and there are 200 billion stars found so far, in fact, far more than that, and many have not been discovered.

Haha remembered a TV movie I watched when I was a child: a man asked Avanti how many stars there are in the sky. Avanti thought for a moment and grabbed his donkey's tail with one hand and said, "There is as much hair as the donkey's tail!" "Hahaha.

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.

There is only one way to determine the number, according to the theory of the universe. Throw a glass from a height of 100 meters and see how many pieces there are, and you will know how many stars there are in the sky.

But it's only a part of the galaxy, and I think there are countless stars, just like the universe.

How many stars are there in the sky? With the naked eye, a person with normal vision may see about 3,500 stars on a clear night without moon and no light interference, while about 7,000 stars are visible to the naked eye, but only half can be seen at a time, because the other half is below the horizon. So there are only about 7,000 stars in the sky?

Of course not, this is only seen with the naked eye, if we use a small telescope to observe the night sky, then the number of stars seen, will increase by dozens of times; If you use the astronomical telescope with a diameter of 60 centimeters at the Purple Mountain Observatory in China to observe the night sky, you can see more than 20 million stars; In the 5-meter-diameter telescope at the Palomar Hill Observatory in California, there are as many as 2 billion stars visible!

Astronomers now believe that the number of stars in the Milky Way alone is many times the total population of the Earth, and in the universe, there are at least more than 20 billion galaxies like the Milky Way, so the stars in the sky can only be described as "innumerable".

There are more than 3,000 stars that can be seen with the human eye, but there are millions of stars in the sky that are invisible to the human eye, like the Milky Way, which has more than 300 billion stars.