The brightness of a star depends on the distance, or the size, and why?

In the vastness of space, there are countless stars that twinkle. And for us humans living on Earth, these stars have become stars in our eyes. But in space, there are tens of thousands of stars, and in a solar system, we can see countless stars.

But why are there some stars that we can see and others that we can't? This is because not all stars reflect bright light. <>

Our earth is in the solar system, and some of the big stars we see are very bright, and some are very faint. Some of these stars are very far away from us, and some of them are very close to us. What are the factors that affect the brightness of a star?

First of all, whether a star will reflect light, the most important thing is whether it can reflect the sun's light.

Or the light of other stars. In addition to the sun's own light, there are many stars that can also reflect their own light. In the universe, there are also stars that can emit light because they can emit the light of stars, and such stars appear to us to be stars that can emit light.

Of course, whether a star can shine or not has a lot to do with its size and distance. If a star is very large, but very far away from us, and does not reflect the light of other stars, it is impossible for such a star to shine even if it is large. There is also a star that is very close to us, but it is a very small star that can reflect the light of the sun, so this star can also be a star that we can see at night.

So in general, the brightness of a star depends most importantly on whether the star can reflect the sun's light and whether it can be seen by our naked eyes. The brightness of a star is related to the size and distance of the star itself to a certain extent, but the most important thing is whether it can reflect the light of the star.

It depends on whether it emits light, whether it reflects the light of the sun or other stars, and how far away it is from Earth. The vast majority of stars in the sky are basically divided into three categories: stars, planets, and satellites. Stars emit light on their own, planets and moons do not emit light, but they reflect light.

They surround the Earth, and during the day we can't see them because of the strong rays of the sun, and at night, we can spot glowing stars.

The brightness of a star depends on its brightness and its proximity to the Earth.

If the object itself is very bright, but very far away from the Earth, then we may look at it very faint or not see it at all.

If the object is not very bright, but it is very close to the Earth, we may look at it very bright, for example, Venus, which only shines by reflecting the sun's light, but because it is close to the Earth, we look at it very bright.

I think it depends on the distance, because the stars themselves are not luminous objects, but reflect the light of the sun, so if they are far away, they may not be as bright as those that are close.

I think it depends on the distance, for example, the moon is actually quite big, but because of the distance, we see that the moon is also relatively small, and the sun is really big, but the distance relationship looks as big as the moon.

The lower the magnitude, the brighter the star. It doesn't matter whether it's absolute magnitude or apparent magnitude.

The higher the magnitude value, the smaller the star, the smaller the star, and the more negative, the brighter the star. The brightness of these two magnitudes is compared in multiples, so that the difference in brightness between the 1st and 6th magnitudes is about 100 times. Therefore, the brightness comparison of magnitude is based on the base.

The difference in rank is the value to the power of power.

Manifestations of magnitude to the naked eye**.

Look at the starry sky with the naked eye and have good eyesight.

In the dark night sky with good air visibility, a star of magnitude 6 can be seen at the darkest limit, and the farthest star can be seen at about 7,000 light-years Seamount II, whose apparent magnitude is equal.

The brightest planet in the sky is Venus, and the magnitude can reach magnitude at its brightest. The brightest amen-like star is Sirius.

At its brightest, the apparent magnitude can reach magnitude. Therefore, it appears that Venus is 18 times brighter than Sirius.

There are two reasons for this: first, the problems of the stars themselves, such as the degree of violentness of the star's surface nucleus, the volume of the star itself, etc.;

Another reason is the distance. Of course, the closer the star, the brighter it looks.

Because there are two reasons that affect the brightness of stars, there is a term in astronomy called absolute magnitude, which is a unified standard for comparing the brightness of stars assuming that they appear to be light-years away from the observer.

Astronomers usually divide the ability of stars to shine into 25 magnitudes, with the strongest ones being about 10 billion times different from the worst ones.

At the time of stargazing.

Look at the starry sky.

Some of the stars can be found to be brighter.

Some stars are more dimmer. How do you calculate the brightness of a star? Astronomers use grades to distinguish the brightness of stars.

In the horoscope we can often see magnitude 1 as well.

2 etc. Explanation of magnitude. This method of differentiation was invented by the ancient Greek astronomer Hibaks. Hibacs divided the stars that can be seen in the sky with the naked eye into six grades.

Then one by one, they are given magnitudes.

Divided into grades 1 to 6With the advancement of science.

It was found in later research.

A star of the 1st magnitude is exactly 100 times brighter than a star of the 6th magnitude.

Other words. Every other magnitude.

The brightness of the stars is doubled. Here's an example: the amount of light of a 3rd magnitude star.

It is a double of a 4th magnitude star.

Or a multiple of a 5th magnitude star. Later, scientists wanted to represent the brightness of the stars more accurately.

Added decimal point to magnitude.

It is used to distinguish between two stars of similar rank. For example, Vega has a magnitude of 0.

And the brightness of five cars and two stars is equal.

The brightness of Vega can be discerned. Reference:

The lower the magnitude, the brighter the star. The first to grade the brightness of stars was the Greek astronomer Hippachus, who lived in the 2nd century BC. He once made a catalog, in which he defined the 20 brightest stars as first-magnitude stars, and the stars visible to the naked eye as sixth-magnitude stars.

He then divided the first- and sixth-magnitude stars into four classes, a classification method that is still used today. <

The lower the magnitude, the brighter the star. The first to classify the brightness of stars was the Greek astronomer Hippachus, who lived in the 2nd century BC. He once made a catalog, in which he defined the 20 brightest stars as first-magnitude stars, and the stars visible to the naked eye as sixth-magnitude stars.

He then divided the first- and sixth-magnitude stars into four grades, a classification method that is still used today.

We see that the brightness of the stars is different, one reason is that the stars are different from the earth, and the other reason is that the brightness of the stars themselves is different. The brightness of a star is determined by its own light emitted or reflected light, and there is also the light emitted by processes such as supernovae**.

Affected by factors such as the degree of violentness of the surface nucleus reaction, the size of the star itself, and the distance from the Earth is also an important reason, the closer the star looks.

The brightness of the stars we see is not the same, which is determined by the size of the stars themselves and their distance from the Earth. Stars are actually stars in the universe, large and small, the larger the volume, the closer to our earth, the brighter they are, and vice versa.

This is similar to the light sources we see at night at a distance and up close. Lights in the neighborhood will be much brighter than lights in the distance, so most bright stars are stars that are closer to us. Some of the stars we see at night will glow on themselves like the sun.

A part of it refracts sunlight, so the brightness will also vary.

The brightness of a star is determined by its distance from the sun, because the star itself does not emit light stars, and only shines by reflecting the sun's light.