At night, the stars appear to move across the sky ?, where stars, whether they are dwarfs or giant stars, are among the most common astronomical objects in this vast universe, and in this mobile we will talk about stars in detail, and also explain why stars appear as if they are moving inside the sky.
What are the stars
Stars are huge celestial bodies made up mostly of hydrogen and helium that produce light and heat from the bubbling nuclear formations within their cores, and the points of light we see in the sky are actually stars and are all light years away from Earth, and stars are the building blocks The basic galaxies, of which there are billions in the universe, and it is impossible to know how many stars there are, but astronomers estimate that in our galaxy the Milky Way alone there are about 300 billion stars.
A star can be briefly defined as a huge, shiny, spherical astronomical body of plasma which is coherent due to the strong gravity in it, and the star derives its luminosity from the nuclear energy generated in it, where the hydrogen atoms fuse but they form elements heavier than hydrogen, such as helium, lithium and other light elements, and this interaction The physicist calls nuclear fusion which produces a very large thermal energy that reaches us in the form of light rays and heat.[1]
See also: When gases interact with each other inside stars, they form
At night, the stars appear to move across the sky
The stars seem to move across the sky Due to the rotation of the Earth around the Sun and due to the rotation of the Earth around itselfIndeed, the stars are not fixed, but due to the enormous distance between planet Earth and these stars appearing in the night sky, the naked eye cannot detect this movement relatively, but sensitive and very accurate scientific devices can detect the movement of stars , and that this movement is in the form of rotation These stars are like the sun around the center of the Milky Way galaxy, because at the center of the Milky Way galaxy, scientists believe that there is a black hole with a very heavy gravity large, which forces stars and astronomical bodies to rotate around it, and in fact there are three repetitive movements of the stars that occur in our sky every night due to the rotation of the Earth on itself, as follows:[2]
- Some stars rise directly due east, travel to the right, then cross the southern high sky, and finally end their motion directly due west.
- Other stars rise in the southeast and follow a semi-arc path through the south before reaching the southwest.
- In the north there are many stars moving in counterclockwise circles.
See also: The stars that go out due to the combustion of the gases they contain are the stars
The most famous stars that can be seen from Earth
There are billions of stars in the Milky Way, but there are some of these stars that have been known to us for a long time, as the reason for the popularity and knowledge of these stars is that most of these stars can be seen with the naked eye , and they are very bright compared to other stellar bodies, and in the following A list of the most famous types of stars in the sky is as follows:[3]
- North Star: Also known as Polaris, this star is in fact very close to the North Celestial Pole, which is why it has been used for centuries as a navigation tool in the Northern Hemisphere.
- Star of Sirius: This star is about 6.8 light-years from Earth and is making its closest approach to Earth, where astronomers expect it to continue to make its closest approach to the solar system during the next sixty thousand years.
- Alpha Centauri system: It is the brightest star in the southern constellation Centauri, and is also the third brightest star in the night sky, and is also the closest star system to Earth.
- Betelgeuse: Because this bright red giant is 650 light-years from Earth, it is one of the largest and brightest stars in the night sky from Earth.
- Star of Rigel: Where this star is between 700 and 900 light-years from Earth, it is the seventh brightest star in the night sky.
- The Heart of Scorpio (English: Antares): It is a giant red star and one of the largest and brightest stars in the night sky, and this star is approximately 550 light-years from Earth.
- Star of Canopus: It is the brightest star in the constellation Carina meridional and the second brightest star in the night sky, located more than 300 light-years from Earth.
By the end of this article, we knew it At night, the stars appear to move across the sky The rotation of the Earth around the Sun and due to the rotation of the Earth around itself, as we have explained in detail what stars are, and we have mentioned the most famous stars that can be seen from the Earth at night.
