SUN.
The star at the center of it all.
SCHEMATIC / NOT A SURFACE MAP
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The measured world
- Mean radius
- 695,700 km
- Mean diameter
- 1,391,400 km
- Mass
- 1.988e+30 kg
- Gravity
- 274 m/s²
- Escape velocity
- 617.7 km/s
- Mean temperature
- 5,500 °C
- Rotation period
- 609.12 Earth hours
- Mean distance from Sun
- 0 AU
Rounded reference values. Rotation is sidereal and differs from the solar day. Giant planets have no solid surface; temperature and gravity use atmospheric reference levels. Some moon counts are omitted because discoveries change them.
Compare with EarthA closer look
The Sun holds almost all the mass of the Solar System.
Nuclear fusion in its core turns hydrogen into helium.
Its equator and poles rotate at different rates.
Atmosphere
A photosphere, chromosphere, and extended corona. Mostly hydrogen and helium.
Discovery
Known since antiquity.