iGCSE Physics - 6.2.2 Stars SUPPLEMENT

This Powerpoint specifically uses the Cambridge iGCSE Syllabus and covers all criteria for – Unit 6.2.2 Stars SUPPLEMENT

Know that one light-year is equal to 9.5 × 1015m

Describe the life cycle of a star:
(a) a star is formed from interstellar clouds of gas and dust that contain hydrogen
(b) a protostar is an interstellar cloud collapsing and increasing in temperature as a result of its internal gravitational attraction
© a protostar becomes a stable star when the inward force of gravitational attraction is balanced by an outward force due to the high temperature in the centre of the star (d) all stars eventually run out of hydrogen as fuel for the nuclear reaction
(e) most stars expand to form red giants and more massive stars expand to form red supergiants when most of the hydrogen in the centre of the star has been converted to helium
(f) a red giant from a less massive star forms a planetary nebula with a white dwarf star at its centre
(g) a red supergiant explodes as a supernova, forming a nebula containing hydrogen and new heavier elements, leaving behind a neutron star or a black hole at its centre
(h) the nebula from a supernova may form new stars with orbiting planets

**Every Powerpoint includes learning objectives, a starter and plenary, suitable activities and review questions with mark scheme. We also provide a free pdf version of the file so it can easily be printed for students as a handout or uploaded to the school VLE system
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