Solar Life Cycle

Numéro d’image : 12334338
Solar Life Cycle
Stages in the birth and death of the Sun. (1) A supernova encourages a passing gas cloud to begin gravitational collapse. (2) The gas cloud contracts and flattens into a protoplanetary disc called the solar nebula. (3) A bipolar outflow of charged particles may also be visible. (4) The Sun begins to shine as a fully fledged star on the Main Sequence. (5) Present day – Sun still shining at an age of 4.6 billion years. (6) Hydrogen runs low, and the Sun expands slightly into a subgiant, growing cooler and redder but more luminous. (7) With hydrogen now totally depleted, the subgiant expands into a huge red giant, around 200 times the size of the original Sun (not to scale). (8) The star pulsates, puffing off its outermost layers to form a glowing planetary nebula. (9). All that is left is the core of the original Sun, now a white dwarf
Licence : Droits gérés
Crédit: Science Photo Library / Garlick, Mark
Taille de l’image : 5341 px × 3272 px
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