When we look up at the sky at night, we can always see the stars in the sky, but during the day, we can only see the blue sky. Why can't you see the stars during the day? The following is the reason why I can't see stars during the day. Welcome to read and refer to it.
Why can't you see other planets during the day?
You can answer the children that the stars are sleeping during the day! But science can't be fooled like this, because no matter day or night, the universe will show people with the same size hole, but the face you see is "left" or "right"! Then why can't you see the stars during the day?
1. The ultra-high brightness of the sun and the apparent magnitude of the sun have reached -26.74. What is this concept?
The apparent magnitude of Venus, the brightest star in the day, is - 4.4, so how many times is the sun brighter than Venus?
According to the above figure, the brightness difference of each magnitude 2.512 times is calculated as:
863850616.16x
About 864 million times!
2. Scattering of atmosphere and suspended particles
If the earth has no atmosphere and no scattering between suspended particles and the atmosphere, the sky will be dark. As long as we keep away from the bright and reflective prospect behind the sun, we can see other stars, but this is impossible on the earth. Unless these diffuse and scattered rays can be filtered out, an extremely deep well is theoretically possible!
Therefore, to see stars during the day, of course, in addition to the moon, because the apparent magnitude of the moon has also reached - 12.7, about 2090 times that of Venus at its brightest! However, supernovae are also very likely to be seen. For example, Orion Betelgeuse will be seen during the day when supernovae erupt in the future!
At night, I feel that there are only stars except the moon. Where are the planets?
In fact, the key is also the angle of view. The angle of view of the sun and moon is as high as 0.5 degrees. What about the other parts of the seven planets? We count the two most typical, Venus and Jupiter:
The angle of view of Venus is: 10 – 66 arcseconds
Jupiter's angle of view is: 30-49 arcseconds
One degree equals 60 minutes and one minute equals 60 seconds
The resolution limit of the naked eye is about 1 jiao, which is the number. When Venus is the largest, it looks good. It is a little higher in the resolution of the naked eye, while Jupiter is below the resolution of the naked eye, which means that these celestial bodies have no surface difference in the naked eye, but only one point! Because their apparent magnitude is high enough and the reflected photons are enough for us to see, no matter how small, in theory, as long as photons enter the naked eye, they can perceive a point, but presumably no one can achieve the ability to perceive a single photon.