Question

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Answer 1

Astronomers believe that stars form when enormous compression waves traveling through gas clouds create dense knots of gas in the cloud. Gravitational forces of these denser areas attract nearby gas particles. As a knot grows, its gravitational force increases, and it attracts more gas particles. Eventually, the knot coalesces into a growing sphere of compressed gas that reaches internal temperatures of a few million degrees C. At this point the gases in the knot’s interior become so hot that their atomic nuclei begin fusing, creating large amounts of nuclear energy and forming a new star. Such brilliant newly formed stars outline the spiral structure of the Milky Way Galaxy. Pressure from the radiation of new stars in turn causes more, higher-density zones to form in the gas cloud, which initiates the birth of more stars. Small, starlike objects called brown dwarfs are similarly formed. Brown dwarfs are larger than planets are, but they do not have enough mass to initiate thermonuclear reactions and become true stars.


Astronomers have developed a theory that planets form from gas and dust encircling young stars. As the density of an emerging star increases, the surrounding gas and dust slowly condense into a spinning disk. Some areas of this disk are thicker than others are, and the gravitational pull of these dense areas attracts nearby dust and gas as the disk orbits the star. Over a period of several millions of years, these dense areas consolidate and grow in size, forming the planets of a solar system. By the end of the 20th century, astronomers had located more than a dozen other star-planet systems outside our own. Astronomers believe many stars have planets orbiting around them.

Answer 2

its enough or u need more