3 Nebula:Large amounts of gas and dust spread out in an immense volumeConsidered to be the birthplace as stars begin here
4 Protostar:A star is “born” when the contracting gas and dust become so hot that nuclear fusion startsThe protostar forms in the nebulaEnormous amounts of energy are released
5 OUR SUN!!! Main Sequence Star Lifespan can last anywheree between 80 billion – 100 billion years90% of a star’s life will be in this stageVary in massUsually medium sized starsNuclear fusion----turnshydrogen into heliumRadiate (shine) energy intospaceExamples: Sirius, AlphaCentauri A and BOUR SUN!!!
6 Red Giant/Super Red Giants: Formed when the star’s hydrogen fuel begins to run outMade up mostly of helium, shrinks and then releases energy as it collapsesAll of its energy and the remaining nuclear reactions causes the outer layers of the star to expand far out into space (swelling the star to many times it original size)As the outer layer expands, the light becomes red
7 White Dwarf (this is the next phase of the red giant) The outer layer of the red giant explodes out into space leaving the white core behindAbout the size of Earth but has the mass of the sun (much denser than Earth)Has no energy, But glows faintly from left over heat.
8 Black DwarfWhen a white dwarf stops glowing it becomes a black dwarfLast stage in a star’s lifeThe star is dead
9 Supernova (happens to super red giants) A super red giant suddenly explodes and forms a supernovaDust and particles are blown out into space and this can lead back to forming a nebulaA supernova can then go in one of two ways: neutron star or black hole
10 Neutron StarMaterial left behind after the supernova explodes forms a neutron starSmall and more dense than white dwarfsAbout the size of a large or a small city on Earth.
11 Black HoleThe most massive stars become blackholesGravity is so strong that gas is pulled inwardNothing can escape, not even light