Answer:
As the main sequence star glows, hydrogen in its core is converted into helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by nuclear fusion, the core becomes unstable and contracts. The outer shell of the star, which is still mostly hydrogen, starts to expand. As it expands, it cools and glows red. The star has now reached the red giant phase. It is red because it is cooler than it was in the main sequence star stage and it is a giant because the outer shell has expanded outward. In the core of the red giant, helium fuses into carbon. All stars evolve the same way up to the red giant phase. The amount of mass a star has determines which of the following life cycle paths it will take from there.
diagram of the life cycles of low and high-mass stars
The life cycle of a low mass star (left oval) and a high mass star (right oval).
the different evolutionary paths low-mass stars (like our Sun) and high-mass stars take after the red giant phase. For low-mass stars (left hand side), after the helium has fused into carbon, the core collapses again. As the core collapses, the outer layers of the star are expelled. A planetary nebula is formed by the outer layers. The core remains as a white dwarf and eventually cools to become a black dwarf.
Explanation:
Answer:
Almost all students join one club or another; clubs usually meet after school, ... require students to gather on weekends to participate in tournaments or have ... So a few days after the entrance ceremony, a gathering is held where the activities ... school gym and listen to eighth and ninth graders explain what the club does.
Answer:
Salvador, Honduras, Guatamala, Nicaragua, Panama, Costa Rica, Belize, mexico
Well the southeastern region other United States was essential whenEngland came and basically conquered us. It was great because it had fertile soil and a really good climate for growing tobacco, which was one of the best resources for the English to make money since they were after gold, which there wasn’t on the Easter coast of the United States.
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