Altair and Vega
According to legend, every year on the seventh day of the seventh month of the lunar calendar, Cowherd and Weaver will meet at Queqiao crossing the river to relieve lovesickness. But in fact, it is impossible for the real Altair and Vega to meet in reality. Both Altair and Vega are stars. It is said that they are much larger than our sun and can emit heat like the sun. They are very far away from our earth. Altair is 16.5 light years away from the earth, and Vega is 26.3 light years away from the earth. So we can see them because their light is too bright, even if they are far away, we can still see their stars. It can be seen from the distance between them and our earth that the two of them are not in the same place. According to popular science astronomers, Altair and Vega are 16 light-years apart. And how far is 16 light years? For example, if the Cowherd writes a WeChat account to the Weaver Girl, it will take 16 years for the Weaver Girl to receive it. So the meeting of the Cowherd and the Weaver Girl is after all just a beautiful fairy tale.
Why won't the stars fall?
starry sky map
Universal Gravity Everyone should know that our earth has gravity. Any matter suspended on the surface of the earth and its surroundings will be drawn to itself by the earth, so why won’t the stars be drawn over? This is because every star we see is a star, and they also have their own gravitational field, and they are far away from the earth, and the gravitational force between them is negligibly weak, and these stars are heavier than the earth. , Their gravitational force is greater than that of the earth. If they are close, I guess it is not the earth that pulls them over, but they are the one that pulls us over. When the time comes, the stars will not fall, but our earth will fall. This is not so beautiful. .
Are meteors stars?
Falling meteor
The meteors we usually see are actually small meteorites in the universe or the phenomenon of friction and burning when dust falls to the earth and is forcibly pulled towards them by the earth. They do not It’s not that the stars we usually see are falling,At best, the powder layer outside the stars will fall off.
Why are some stars brighter and a bit darker?
Milky Way
The starlight of the stars is seen by us through the atmosphere of our earth. The stars with the same bright light will definitely be brighter if we look closer to our earth, and those far away from us will have to be It is darker; and depending on the brightness of the stars, stars with strong luminous power will look brighter, and stars with weak luminous power will look darker.
Why do you see more stars in summer than in winter?
Milky Way sky map
Astronomers divide the stars into six classes according to their brightness. According to observations, can be seen by the naked eye. There are 20 first-class stars , 46 second-class stars, and third-class stars 134 There are 458 stars in the 4th magnitude, 1476 stars in the 5th magnitude, and 4840 stars in the 6th magnitude, a total of 6974 stars. I wonder if you have counted how many stars there are in the sky when you look at the stars? On a clear summer night, there are many stars in the sky. We can see the Milky Way. From a distance, the Milky Way is like an elliptical disk, thick in the middle, thin on both sides, dense and dense in the middle, and stars on both sides. It is relatively sparse. As the earth revolves, the night sky in summer is directly facing the center of the Milky Way, so the entire Milky Way can be seen. In winter, the starry sky faces the edge of the Milky Way, so there are fewer stars.
