The Life of a Star
3 marks · EasyDraw a simple labelled sequence showing the main stages in the life of a star similar to our Sun, from nebula to black dwarf.
State the stage at which fusion of helium nuclei occurs.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) Nebula → Main Sequence → Red Giant → White Dwarf → Black Dwarf, labelled in sequence · must show stages in order, labels
(b) Red giant
Must show: nebula, main sequence, red giant, white dwarf, black dwarf
Common mistakes: Missing one or more stages; Misplacing helium fusion
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correctly sequences and clearly labels at least four stages (nebula, main sequence, red giant, white dwarf).
B1 (a) · 1 mark · Includes black dwarf as the final stage.
B1 (b) · 1 mark · Correctly states 'red giant' as the helium fusion stage.
Worked solution
b) Helium fusion takes place during the red giant stage.