Tip of the red-giant branch
Tip of the red-giant branch
Primary distance indicator used in astronomy.
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Readers' pathsAug 2026 – Oct 2026
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Helium flash
Brief thermal runaway nuclear fusion in the core of low-mass stars.
37%
Red-giant branch
Portion of the giant branch before helium ignition.
36%
Asymptotic giant branch
Grouping of evolved cool luminous stars.
14%
Hertzsprung–Russell diagram
Scatter plot of stars showing the relationship of luminosity to stellar classification.
12%
Readers come from
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Sun
Star at the centre of the Solar System.
54%
Red-giant branch
Portion of the giant branch before helium ignition.
17%
Hertzsprung–Russell diagram
Scatter plot of stars showing the relationship of luminosity to stellar classification.
15%
Cosmic distance ladder
Succession of methods by which astronomers determine the distances to celestial objects.
6.9%
Solar mass
Standard unit of mass in astronomy.
4.2%
Stellar evolution
Changes to stars over their lifespans.
3%