Stellar · Stars
The Sun
1.393 million kmThe star containing almost all the solar system’s mass and powering nearly every surface ecosystem.
Stellar ↔ Stellar
How much larger is Betelgeuse than the Sun?
A variable red supergiant has no perfectly fixed edge, so this comparison uses the catalog’s cited representative diameter.
Linear ratio718.03×
Using the stated linear measurements, Betelgeuse is 718.03× The Sun.
Stellar · Stars
Betelgeuse
≈1 billion kmA pulsating red supergiant with a surface so diffuse that its quoted diameter changes with wavelength and time.
The answer
A ratio, an analogy and the definitions behind both.
Using the stated linear measurements, Betelgeuse is 718.03× The Sun.
About 718.03× The Sun linear spans fit across the selected measurement of Betelgeuse.
mean diameter versus estimated photospheric diameter
The metre values can be divided as linear spans, but the two entries do not describe identical kinds of boundary.
The Sun is measured; betelgeuse is variable.
Representative, variable and model-dependent values are useful for perspective only when their status remains visible.
Measurement ledger
What exactly was divided?
| Landmark | Value | Measurement | Certainty | Source |
|---|---|---|---|---|
| The Sun | 1.393 million km | mean diameter | Measured | NASA Science ↗ |
| Betelgeuse | ≈1 billion km | estimated photospheric diameter | Variable | NASA Science ↗ |