At night, the stars seem to move across the sky ?, Where stars, whether dwarf stars or giant stars, are among the most common astronomical objects in this vast universe, and in this mobile we will talk in detail about stars, and we will also explain why stars appear as if they are moving in the sky.
What are the stars
Stars are huge celestial bodies consisting mostly of hydrogen and helium that produce light and heat from the churning nuclear formations within their cores, and the points of light that we see in the sky are actually stars and they are all light years away from Earth, and the 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 that is coherent due to the strong gravity in it, and the star derives its brightness from the nuclear energy generated in it, where hydrogen atoms fuse with each other to form elements heavier than hydrogen, such as helium, lithium and other light elements, and this interaction The physicist called nuclear fusion that produces 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 seem to move across the sky
The stars seem to move across the sky Because of the Earth’s rotation around the Sun and because of the Earth’s rotation around itselfIn fact, the stars are not fixed, but because of the huge distance between planet Earth and these stars that appear 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 in the center of the Milky Way galaxy, scientists believe that there is a black hole with a very huge gravity, which forces stars and astronomical bodies to rotate around it, and in fact there are three repetitive movements of stars that occur in our sky every night due to the rotation of the Earth about itself, as follows:[2]
- Some stars rise directly eastward, heading to the right, then cross the high southern sky, and finally end their movement directly westward.
- Other stars rise in the southeast and follow a semi-arclike path through the south before reaching the southwest.
- In the north there are many stars that move in anti-clockwise circles.
See also: The stars that are extinguished due to the combustion of the gases in them 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]
- Polaris star: Also known as the North Star, in fact this star is very close to the North Celestial Pole, which is why it has been used as a navigational tool in the Northern Hemisphere for centuries.
- Sirius star: This star is about 6.8 light years away from Earth, and this star is approaching Earth, where astronomers expect it to continue to approach the solar system during the next sixty thousand years.
- Alpha Centauri System: It is the brightest star in the southern constellation Centauri, and it is also the third brightest star in the night sky, and it is also the closest star system to Earth.
- Betelgeuse: As this bright red giant lies 650 light-years from Earth, it is one of the largest and brightest stars in the night sky from Earth.
- Rigel star: Where this star is located between 700 and 900 light years from Earth, it is the seventh brightest star in the night sky.
- The heart of Scorpio (in English: Antares): It is a giant red star and one of the largest and brightest stars in the night sky, and this star is about 550 light-years from Earth.
- Canopus star: It is the brightest star in the constellation South Carina and the second-brightest star in the night sky, located more than 300 light-years from Earth.
At the conclusion of this article, we have known that At night, the stars seem to move across the sky The earth’s rotation around the sun and because of the earth’s rotation around itself, as we explained in detail what the stars are, and we mentioned the most famous stars that can be seen from the earth at night.