How big are the stars in the sky? Get off the ground and ask for more luck

The size of each star is different, but the size is not much different when it is far away.

On February 14, 1990, Voyager 1 took a picture of Earth from 6.4 billion kilometers away. The name of ** is "dim blue dot", and the earth in this ** picture is like a speck of dust, which shows the vastness of the universe.

The distance between the stars and the Earth ranges from 380,000 km to 70,000 light years.

Stars generally refer to luminous stars, including eight galaxies, of which the Moon is the closest star to the Earth at a distance of about 380,000 kilometers, the Sun is about 100 million kilometers away from the Earth, and the farthest star is at the other end of the Milky Way, about 70,000 light-years from the Earth.

At night, we can see the stars directly with the naked eye, usually 5,000 to 8,000 light-years away from Earth. Stars at a distance of 5,000 light-years appear relatively bright and can be easily seen and discerned with our eyes; Stars at a distance of 8,000 light-years appear much dimmer and are usually seen only on a better night when the weather is better.

A light year is a unit of length in astronomy, which refers to the distance that light travels in space for a year, the speed of light is nearly 300,000 kilometers per second, and the distance traveled in a year reaches trillions of kilometers, that is, 1 light year. Some distant stars are very far away from us, but because the light they emit is bright enough, they can still be seen by us, such as Cowherd Star is light years away from us, Sirius is light years away from us, Tianjin is 1410 light years away from us, and the distant seamount is 7500 light years away from us, which is usually not visible at all, and only when the weather is good, the sky is cloudless and the air is clear, can the star be vaguely observed.

The total number of stars that can be seen with the naked eye is only about 6,000, and the number of stars seen through telescopes is much larger. That means:

Are they countless?

Stars are very dense in the Milky Way direction, but relatively few in other directions, which means that we have to abandon the globular stars.

Overall concept. If so, the number of stars in each direction should be as many as the number of stars in the Milky Way direction, and, with the nearer stars, it will be weaker.

The light flickered against the background (not as spectacular as it is now) and the whole sky would be illuminated.

We must assume, then, that the stars exist in large non-spherical clusters and extend farther in the galactic direction than in other directions. Since this is it.

then the Milky Way shows that the stars are clustered into a lens shape or hamburger shape. This lens-shaped cluster is called the Milky Way (from the Greek definition of Milky Way), and the name Milky Way has been retained due to the dark band of light we see surrounding the sky.

The first person to propose that stars exist in occultation galaxies was occultation astronomer Thomas. Wright. He made the proposal in 1750, but he had a good idea.

Like is so confusing and incomprehensible that few people pay attention to him at first. Of course, even if the Milky Way is lenticular shaped, it can always be in the long radial direction.

Extend. Although only a relatively small number of stars are seen on the outside of the Milky Way, there are countless stars inside the Milky Way.

To illustrate, William. Herschel counted the number of stars. Naturally, it is impossible to count all the stars in a certain period of time.

Herschel selected 683 small areas, evenly distributed in the sky, and counted the stars seen with a telescope in each area. With this kind of party.

Law, he got the number of stars in what we now call an "imaginary poll" in the sky. This is the first example of the application of statistics to astronomy.

Herschel believed that the number of stars in each region was related to how close it was to the Milky Way. In all directions, the number of stars increases with the degree of approximation to the Milky Way.

and steady growth. From the number of stars he counted, he could estimate the number of stars in the Milky Way and how big the Milky Way might be. In 1785, he.

The results were announced, and it was proposed that the long diameter of the Milky Way was about 800 times the distance from the Sun to Sirius, and the short diameter was 150 times that distance. Half a century later, days.

The actual distance of the wolf star was calculated, and it was concluded that Herschel believed that the Milky Way had a long diameter of 8,000 light-years and a short diameter of 1,500 light-years. At the same time, he calculated the Milky Way.

There are 8 billion stars in the system. This is a huge number, but it is not uncountable.

In nearly two centuries, astronomers have explored the Milky Way with far better instruments and techniques than Herschel could have used, and now know that the Milky Way is larger than Herschel.

The ears expected to be much bigger. Extending at least 100,000 light-years in the long radial direction, it may have 200 billion stars. However, it can be said that we have confirmed the Milky Way.

And that the stars are not innumerable but calculable, and this is the credit of Herschel.

There are about a trillion trillion stars in the sky. Scientists have calculated that there are about 125 billion galaxies that have been discovered and observed, and each galaxy has hundreds to trillions of stars like the sun. Our galaxy is home to about 40 billion planets.

So with a simple math problem, it's not hard to understand that there are many, many stars in the universe that we've observed. The total number of planets in the universe is about 1 trillion (1 followed by 20 zeros). 0

There are about 6,000 visible in the flesh sleep, and only about 3,000 at a given time.

Hum! In fact, the stars in the sky can be counted! Astronomers divide the stars in the sky into 88 constellations according to their regions, and divide them according to the brightness level of each star

Very bright is a first-magnitude star, followed by a second-magnitude star. Third-magnitude star. The darkest visibility to the naked eye is a sixth-magnitude star.

As long as you have the patience to count one constellation, then another, and count the stars of each constellation according to their rank, then you can see the stars in the whole sky in a few nights. Astronomers counted more than the stars could be seen in the sky. For example, there are only 20 first-magnitude stars, 46 second-magnitude stars, 134 third-magnitude stars, 458 fourth-magnitude stars, 1,476 fifth-magnitude stars, and 4,840 sixth-magnitude stars, adding up to only 6,974, which is not even the number of grains in a pot of rice!

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.

How many stars are there in the sky? There is a lot of information in the sky, how many are there? Because the number of stars in the Milky Way is very large, there are few. You hate to see it and say it's a gorilla, and there are a lot of little stars that you can't see.

There are about 6,000 stars that can be seen with the naked eye, and only people with good eyesight can see these 6,000, and there are about 100 billion stars in the Milky Way, 400 billion stars. If you can look at the stars with a telescope, then you can see a lot more stars than with the naked eye, and those fainter stars, you can't see with the naked eye, you can use a telescope.

So far, there are at least a billion or more.