How many stars are there in the sky? What are they? How far away are they from Earth?

I'm coming to you! How much do you know about the starry sky.

About 3 after 23 zeros.

Peter of the American astronomer at Yale University. 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.

Which star are you talking about?

Some stars are thousands of meters away from us, some stars are millions of light-years away from us, and some can't even think of it because he is too far away.

There are so many stars in the universe that you can't measure them if you don't say which one they are.

Since the birth of mankind, the galaxy in the night sky has always been yearning and curious. Looking up at night, the sky is full of stars, the vast universe, you may also have such questions? How far away are these stars?

Is there a stargazer like us on one of the stars? "First of all, let's look at the nearest Centauri, Proxima Centauri, which is light-years away (9,460.5 billion kilometers per light-year), which is the distance that light travels for four years.

Voyager 1, the farthest probe currently flown by man, has traveled about 21.1 billion kilometers for more than four decades at a speed of 61,200 kilometers per hour, only light-years. It's like a snail crawling from Earth to Mars.

So how do we know the distance of these stars? Our ancestors here have begun to understand the stars at the earliest, they divide the stars flying in the sky into directions, this is the constellation, such as the ecliptic signs of the earth's equator, which refers to the twelve constellations, and the astronomical community has been divided into 88 constellations.

Many of us believe in the zodiac signs and the astrology of the ancient Chinese, and the astrology of the West is all curiosity and yearning for the universe. Of course, the stars in these constellations are hundreds of millions of times farther away than we think.

We can see about 6,000 stars throughout the day, some of which are thousands of light-years away. Their light was also thousands of years ago, and it is only now that it has reached our eyes, and perhaps some of the stars have long since disappeared.

How is the distance of the stars measured? Scientists can measure with Cepheid variables, and measuring the period of light emitted by stars can get their distance. In addition, there are various measurement methods such as trigonometric disparity method, moving cluster method, etc.

Where are these stars and our sun, we may be worth pondering. "We come from the stars, and we go from the stars at last. ”

The stars in the sky are far away and near us.

The closest star is the Moon, which is a satellite of the Earth and is only 380,000 kilometers away from us.

This is followed by Venus and Mars. Venus and Mars are both planets in the solar system, and their closest to Earth is only a few tens of millions of kilometers. Then there are Mercury, Jupiter, Saturn, etc.

Among the stars, the Sun is the closest, only 100 million kilometers from the Earth. The stars we see at night are all stars in the Milky Way. Aside from the Sun, the closest star to Earth is light-years away.

There are fewer than 100 stars at a distance of 20 light-years from Earth. Of the stars we can see, the farthest from Earth is the one on the other side of the Milky Way, at a maximum distance of 70,000 light-years.

Stars that are far away are in extragalactic galaxies, and they cannot be seen with the naked eye.

The stars in the sky are far and near from our earth. The Moon is a satellite of the Earth and is the closest planet to the Earth. The average distance from Earth is only 380,000 kilometers. Eight planets in the solar system.

The farthest from Earth is Neptune.

It was about 4.4 billion kilometers closest to Earth. The Sun is the closest star to Earth, about 100 million kilometers away. Proxima Centauri.

It is the closest star to us outside of our solar system. It's light years away from us. In other words. Than Linqing.

The light emitted. It takes years to reach Earth.

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The universe is very vast, and it is still difficult to explore distant stars with the current technology of human beings.

Stars refer to celestial bodies in the universe that are visible to the naked eye. The activity of the energy inside the star makes the star irregularly shaped. Stars can be broadly divided into moons, planets, stars, comets, and white dwarfs.

Wait. The stars are the planets. Planet is the scientific name.

And the stars are the literary name. Most of the planets we look up at are called stars by us, and scientifically we call them planets. Just as we usually call it the moon, we are scientifically called the moon.

In the clear night sky, the sky is full of stars and twinkles, densely packed, and there are almost too many to count. Are you really too many stars to count? Astronomers tell us that the stars in the sky that can be seen with the naked eye can be counted.

Astronomers divide the stars in the sky into 88 regions, that is, 88 constellations; According to the brightness of the stars, the stars are divided into grades, the brightest is the 1st magnitude star, the 2nd magnitude star is fainter than the 1st magnitude star, the 3rd magnitude star, the 4th magnitude star, the 5th magnitude star, the 6th magnitude star, and the 6th magnitude star is the faintest star that can barely be seen by the naked eye.

Astronomers tell us that after counting a constellation, counting another constellation, and counting the stars in each constellation according to their rank, we find that there are 20 stars of first magnitude, 46 stars of second magnitude, 134 stars of 3rd magnitude, 458 stars of 4th magnitude, 1476 stars of 5th magnitude, and 4840 stars of 6th magnitude. In total, there are 6,974 stars visible to the naked eye in the sky.

If we look at it with an ordinary astronomical telescope, we can find more than 50,000 stars, and the largest astronomical telescope in modern times, can see more than 1 billion stars. In fact, the number of stars in the sky is far more than that, and some planets are so far away from the Earth that even the largest astronomical telescopes cannot find them. Some distant galaxies, in huge astronomical telescopes, are just vague specks of light, but they contain hundreds of millions of planets.

The universe is endless, and modern astronomy can see only a small part of it. How many huge galaxies there are in the universe, and how many galaxies have not yet been discovered, are still a mystery that has not yet been solved.

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.