Question

How do stars produce energy?

Answer 1

Hint: The nearest star to Earth is the Sun. Many stars are observable to the naked eye from Earth during the night. They seem as a bunch of fixed bright points in the sky due to their large distance from Earth.

Complete answer: Nuclear fusion is the ultimate source of energy for all the stars. They are mainly composed of hydrogen and helium and are packed so densely that the pressure is sufficient to activate nuclear fusion reactions.
In this reaction, the nuclei of two atoms combine to develop a new atom. Although nuclear fusion reactions need a lot of energy to initiate, they produce tremendous amounts of energy. This energy motions outward through the layers of the star until it enters the star’s outer surface. The outer layer of the star glows brilliantly, delivering the energy out into space as electromagnetic radiation.
In particle accelerators, subatomic particles are propelled until they have attained almost the same amount of energy as found in the core of a star. When subatomic particles collide head-on, new particles are developed. This method simulates the nuclear fusion reaction and the conditions that enable the first helium atom to generate from the collision of two hydrogen atoms in the first few minutes of the universe.

Note: The Universe consists of approximately 1×1024 stars. The Pole star is the brightest star that appears to both the poles. It helps the sailors when they travel in an isolated ocean. It's significance is that the axis of the Earth is focused almost directly at it. The twinkling of stars is as a result of the atmospheric refraction of star's light. Hence, the light from the star that reaches our eyes alters continuously and they seem to twinkle