Chapter 1
The hydrogen countdown
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Chapter 2
The red giant expansion
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Chapter 3
The planetary nebula phase
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Chapter 4
The white dwarf retirement
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YOUR GOAL
Master of The future of our Sun
Ch 1 · The hydrogen countdown
artiteacher The hydrogen countdown
Earth-sized star, Earth-sized star, we'll shrink right down when the hydrogen's gone!
Fun Fact
Solar weight loss: The Sun loses about 4 million tons of mass every second just by shining.
Glossary
main sequence (noun)
The longest stage of a star's existence during which it continuously fuses hydrogen into helium. The Sun is halfway through this ten-billion-year phase, leaving five billion years of core hydrogen fuel.
The longest stage of a star's existence during which it continuously fuses hydrogen into helium. The Sun is halfway through this ten-billion-year phase, leaving five billion years of core hydrogen fuel.