SCI_2_ORIGIN.OF.UNIV_PPT (1) (1) PDF : Stellar Evolution, Big Bang
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Saint Louis College - Cebu
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Summary
This document contains information about stellar evolution, discussing the life cycle of low and medium-mass stars as well as high-mass stars, including the stages of nebulae, protostars, main sequence stars, red giants, red supergiants, supernovae, neutron stars, and black holes. It also explores different theories about the origin of the universe, such as the Big Bang theory, Steady State theory, Planetesimal theory, and the Tidal theory, alongside a nebular hypothesis. The document concludes with a concept map, showcasing the relationships between the concepts and a list of references.
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ACTIVITY #1 : JUMBLED WORD VISUAL CLUE ANSWER AGR LARGE EL ASG GAS ACTIVITY #1 : JUMBLED WORD VISUAL CLUE ANSWER ARS STARS TS SUDT DUST LODUSC CL...
ACTIVITY #1 : JUMBLED WORD VISUAL CLUE ANSWER AGR LARGE EL ASG GAS ACTIVITY #1 : JUMBLED WORD VISUAL CLUE ANSWER ARS STARS TS SUDT DUST LODUSC CLOUDS ACTIVITY #1 : JUMBLED WORD VISUAL CLUE ANSWER SPLTANE PLANETS L XG A A Y GALAXY Different Theories on the Origin of the Universe SCIENTIFIC THOUGHTS: Steady State Theory Planetesimal Hypotheses Tidal Theory Life Cycle of a Star A STAR IS BORN – STAGES COMMON TO ALL STARS All stars start as a nebula. A nebula is a large cloud of gas and dust. Gravity can pull some of the gas and dust in a nebula together. The contracting cloud is then called a protostar. A protostar is the earliest stage of a star’s life. A star is born when the gas and dust from a nebula become so hot that nuclear fusion starts. Once a star has “turned on” it is known as a main sequence star. When a main sequence star begins to run out of hydrogen fuel, the star becomes a red giant o red super giant. THE DEATH OF A LOW OR MEDIUM MASS STAR After a low or medium mass or star has become a red giant the outer parts grow bigger and drift into space, forming a cloud of gas called a planetary nebula. The blue-white hot core of the star that is left behind cools and becomes a white dwarf. The white dwarf eventually runs out of fuel and dies as a black dwarf. THE DEATH OF A HIGH MASS STAR A dying red super giant star can suddenly explode. The explosion is called a supernova. After the star explodes, some of the materials from the star are left behind. This material may form a neutron star. Neutron stars are the remains of high-mass stars. The most massive stars become black holes when they die. After a large mass star explodes, a large amount of mass may remain. The gravity of the mass is so strong that gas is pulled inward, pulling more gas into a smaller and smaller space. Eventually, the gravity becomes so strong that nothing can escape, not even light. References Earth Science Book ( C and E Publishing )
