PowerPoint Presentation

Birth , Life and Death of a StarLearning Objective:To learn about the life cycle of a star.Learning Outcomes:All: Will be able to correctly name (C) and simply describe (B)the phases in a life cycle of a star.

Most: Will be able to describe the forces in action during the main phases of a stars life cycle (B/A)

Some: Will have good knowledge about each section, which will allow them to answer A/A* exam questions with full or near to full marks. Video on life of a star

Birth of a StarAll stars start life as a nebula of gas and dust. Over millions of years gravity pulls these closer together.Gravitational forceBirth of a starNebulaPressure builds up and the core starts to heat up giving out infra red radiation.Birth of a starProtostarStarThe gravity eventually gets so big and the temperature gets so high that nuclear fusion starts, it becomes a starThe dust and gas from the nebula is added to the protostar, it gains mass. As mass is gained gravity increases and the temperature within the protostar increases

Life of a starRadiation PressureFrom the energy of fusionGravitational forceFrom the mass of the materialA Stable Star like our SunNuclear fusion4 Hydrogen 1Helium + ENERGY(Grade A)The force of the radiation pressure from nuclear fusion is balanced with the gravitational force in a stable star. (Grade B)

Death of a StarStar like our SunA large StarStarRed GiantWhite dwarfBlack DwarfEventually a star the size of our sun becomes a Red Giant.The star keeps increasing in size until the gravitational force causes it to collapse into itself creating a White DwarfThis cools down to become a black dwarf.Large StarRed SupergiantSupernovaNeutron StarPulsarBlack HoleA larger star eventually becomes a super Red Giant.This then collapses, heats up and explodes in a supernova.The small core becomes a neutron star.This can turn into a pulsarIf a star is large enough itll become a black hole.