write a paragraph on the birth and life cycle of stars
Answers
A star collapses when the fuel is used up and the energy flow from the core of the star stops. Nuclear reactions outside the core cause the dying star to expand outward in the "red giant" phase before it begins its inevitable collapse. If the star is about the same mass as the Sun, it will turn into a white dwarf star.
Answer:
Stars are born out of nebulae. Nebulae are clouds made up
mainly of hydrogen gas and dust particles. The particles in these clouds are attracted
towards one another due to the force of gravity. As a result, the cloud contracts and
becomes dense and spherical in shape. At the same time, the pressure of the gas at the
core of the cloud increases causing the temperature to rise tremendously and energy
generation processes start there. Such a spherical cloud of hydrogen is called a ‘star’.
Later, processes such as contraction, expansion, rise in temperature, etc. bring about
changes in the nature of the star. These changes occur over a very long period of time
and constitute the lifecycle of stars. The different forms of the stars at various stages
during this lifecycle are identified as different types of stars.
Explanation: