How many constellations is the sky _ How many constellations is the sky?

Astronomers divide the stars in the whole sky into several constellations by region.

There are billions of galaxies in the whole universe, each galaxy contains billions of stars, and some stars are surrounded by several planets.

The lowest brightness of stars visible to the naked eye is 6. Under excellent observation conditions, there are about 7000 stars in the whole sky. And people in a hemisphere can see around 3500.

People always say that there are countless stars in the sky, but in fact all the stars that can be seen by the naked eye can still be counted clearly.

Astronomers divide the stars in the sky into 88 constellations by region. Among them, there are 29 constellations in the northern sky (bounded by the celestial equator); There are 46 constellations in the southern sky and 13 constellations across the celestial equator. As long as we are patient, we can count the stars in one constellation and then the next constellation, so that we can count the stars that can be seen by the naked eye. According to the results calculated by astronomers, there are 6 stars of magnitude 0; 1 Isometric14; 46 second-class stars; 3 stars134; 458 4 stars; 5 stars1476; There are 4840 6-level stars ... not more than 7000 in total.

If we use binoculars, the situation will be different. We can see more than 50,000 stars even with a small telescope. The largest astronomical telescope in modern times can see more than 654.38 billion stars.

In fact, there are many more stars in the sky. The universe is endless, and what modern astronomers see is only a tiny part of it.

Responder: Manager Biao Sa Ying level 5 1 1-5 06:36.

The total number of stars visible to the naked eye is only about 6000, and the number of stars seen through telescopes is much more. this means

Can't they count?

The stars in the direction of the Milky Way are very dense, while the stars in other directions are relatively rare, which means that we must abandon the stars that form spherical structures.

Overall concept. In that case, there should be as many stars in all directions as in the direction of the Milky Way, and the closer the stars are, the weaker they are.

The light flashes in the background (not as spectacular as it is now) and the whole sky will be lit up.

Then, we must assume that stars exist in large aspherical clusters and extend farther in the direction of the Milky Way than in other directions. In that case.

Sample, then the Milky Way shows that the stars are gathered together in the shape of lenses or hamburgers. This lens-shaped cluster is called the Milky Way (Greek definition comes from the Milky Way).

At the same time, because of the dark light band around the sky, we keep the name galaxy.

The first person to suggest that stars exist in shadow galaxies is Thomas, a shadow astronomer. Wright. He made a suggestion in 1750, but his idea is good.

This elephant is so confusing and incomprehensible that few people noticed it at first. Of course, even if the milky way is lens-shaped, it can always be in the long diameter direction.

Expand. Although only a few stars can be seen outside the Milky Way, there are countless stars inside the Milky Way.

To illustrate the problem, William. Herschel counted the stars. It is naturally impossible to count all the stars in a certain period of time.

Herschel chose 683 small areas, evenly distributed in the sky, and then counted the stars seen through the telescope in each area. in this way

Method, he got the number of stars that we now call "imaginary voting" in the sky. This is the first example of the application of statistics to astronomy.

Herschel believes that the number of stars in each region is related to its proximity to the Milky Way. In all directions, the number of stars increases with the approach to the Milky Way.

Steady growth. From the number of stars he counted, we can estimate the number of stars in the Milky Way and the possible size of the Milky Way. In 1785, what

The results show that the long diameter of the Milky Way is about 800 times of the distance from the sun to Sirius, and the short diameter is 150 times of this distance. Half a century later, one day

The actual distance of the wolf star has been calculated, and it can be concluded that Herschel thinks that the long diameter of the Milky Way is 8000 light years and the short diameter is 1500 light years. At the same time, he discovered the Milky Way.

There are 8 billion stars in this system. Although this is a huge number, it is not uncountable.

In the past two centuries, astronomers have explored the Milky Way with much better instruments and techniques than Herschel. Now they know that the Milky Way is bigger than Herschel.

The ears are much bigger than expected. It extends at least 654.38 million+light-years in the long diameter direction and may have 200 billion stars. But it can be said that we have confirmed the Milky Way.

And the stars are not countless but countable, which is due to Herschel.

Responder: Location on the left-Chief Operating Officer level134-2717: 21

There are as many stars as there are in the universe. It is impossible to determine the specific figures by current science, and it can only be described by tens of billions.

Respondent: Xiao Yi-Assistant II 4-27 17:2 1

There are about 10 20th-power stars in the universe that telescopes can reach now.

If we observe and calculate with the naked eye, we may count 6000 stars in the whole sky. Since we can only see half of the night sky and the other half of the day when we observe the starry sky at night, we can only count 3000 stars.

You can see more stars with a telescope. The larger the aperture of the telescope, the more stars you can see. For example, a 3 cm telescope can see 40,000 stars, and a 5 m telescope can see 3 billion stars. However, there are too many stars in the universe. There are 200 billion stars in the Milky Way alone, so no matter how big the telescope is, it is impossible to calculate how many stars there are in the universe.