Question

Atul came to know from his father that a pole star is the only star in the sky that does not move as the night passes. But his father did not tell him the reason. Can you help him?

Answer 1

Hint:A star is an astronomical object that is made up of a luminous spheroid of plasma that is held together by gravity. The Sun is the closest star to Earth. Many other stars are visible to the naked eye at night, but they appear as fixed points of light in the sky due to their great distance from Earth.


Complete step by step solution:
The birth of a star begins with the gravitational collapse of a gaseous nebula containing mostly hydrogen, helium, and trace amounts of heavier elements. A star's total mass is the most important factor in determining its evolution and ultimate fate.
A star shines for the majority of its active life because of thermonuclear fusion of hydrogen into helium in its core, which releases energy that travels through the star's interior and then radiates into space. A star's core becomes a stellar remnant at the end of its life: a white dwarf, a neutron star, or, if massive enough, a black hole.
The rotation and movement of the Earth through its orbit. However, stars have their own unique motion through space. As a result, when we say that stars “move,” we could be referring to the Earth, their own movements, or both!
Due to the obvious earth's rotation, stars appear to be moving. However, the pole star is oriented in the same direction as the earth's axis. As a result, the angle of vision between the earth and the pole star is unaffected by rotation. As a result, it does not move as the night progresses.

Note:
As in the case of planetary systems and star systems with two or more stars, stars can form orbital systems with other astronomical objects. The gravitational interaction between two such stars with a relatively close orbit can have a significant impact on their evolution. A star cluster or galaxy, for example, can be part of a much larger gravitationally bound structure.