Life cycle of stars

Jack Willepotte
Mind Map by Jack Willepotte, updated more than 1 year ago
Jack Willepotte
Created by Jack Willepotte about 4 years ago
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Description

Mind Map on Life cycle of stars, created by Jack Willepotte on 02/16/2016.

Resource summary

Life cycle of stars
1 1) PROTOSTAR - simply the force of gravity causing gas and dust to spiral in together
1.1 2) MAIN SEQUENCE STAR - gravitational energy is converted into heat energy causing temperature to rise when its hot enough hydrogen nuclei undergo nuclear fusion to form helium nuclei giving out masses of heat and light giving birth to a star, smaller clumps of dust and gas may form planets that orbit the star
1.1.1 3) MAIN SEQUENCE STAR - the star enters a long and stable period where the heat created by the nuclear fusion creates an outward pressure to balance the gravitational force pulling everything inwards the stars energy output is then maintained for millions of years due to the collosal amount of hydrogen it consumes the MAIN SEQUENCE STAR period lasts around several billion years (the sun is halfway through this period)
1.1.1.1 eventually the hydrogen runs out and heavier elements (e.g iron) are made by nuclear fusion of helium the star then swells into a RED GIANT if its a small star or RED SUPER GIANT if its a big star it becomes red due to the surface cooling
1.1.1.1.1 RED GIANT - a small/medium star then becomes unstable and ejects its outer layer of dust and gas as a PLANETARY NEBULA
1.1.1.1.1.1 WHITE DWARF - leaving behind a hot, dense and solid core
1.1.1.1.1.1.1 BLACK DWARF - occurs after the white dwarf has cooled small black dwarfs eventually dissapear
1.1.1.1.1.2 However big stars undergo more fusion and glow brightly again they expand and contract several times forming elements as heavy as iron in various nuclear reactions eventually it explodes as a SUPERNOVA forming elements heavier than iron and ejecting them into the universe to form new planets and stars.
1.1.1.1.1.2.1 the exploding supernova throws its outer layers of dust + gas into space leaving a very dense core called a NEUTRON STAR if the star is big enough it will become a BLACK HOLE
2 PROTOSTAR
2.1 MAIN SEQUENCE STAR
2.1.1 RED GIANT
2.1.1.1 WHITE DWARF
2.1.1.1.1 BLACK DWARF
2.1.2 RED SUPER GIANT
2.1.2.1 SUPERNOVA
2.1.2.1.1 NEUTRON STAR
2.1.2.1.2 BLACK HOLE
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