define the life cycle of a star
Answers
Answer:
The starting phase for all stars, including our Sun, begins when a dense region in a nebula begins to shrink and warm up. This is usually the result of one of several events that may occur to initiate the gravitational collapse of a molecular cloud. The means by which this occurs include galactic collisions or a devastating nearby supernova explosion sending ruptured matter into the clouds at very high speeds. Each of these stellar maternity wards can form anything from a few dozen to thousands of stars.
To form a star like our Sun, which is 864,400 miles (1,391,000 kilometres) across, it would take a collection of gas and dust a hundred times the size of our solar system. This is just the beginning. Once such a large amount of gas and dust huddle together, they form what we call a protostar. An object is considered a protostar for as long as material is still falling inward. For our Sun, and stars of the same mass, the protostar phase would have ended after approximately 100,000 years. After this, the protostar stops growing and the disk of material surrounding it is destroyed by radiation.
Answer:
Hi .. Depression?? Be Happy
Explanation:
A star's life cycle is determined by its mass. A star's mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born. ... Over time, the hydrogen gas in the nebula is pulled together by gravity and it begins to spin.