Stars
Fusion reactors of the universe, from red dwarfs to giants.
Sun (G2V star)
Our star holds 99.86% of the Solar System's mass. Fusion in its core converts 4 million tonnes of mass into energy every second (E=mc²).
- Type
- G2V main-sequence
- Mass
- 1.989 × 10³⁰ kg
- Surface temp
- ~5,500 °C
- Core temp
- ~15 million °C
Source: NASA Sun facts
Proxima Centauri
The closest star to the Sun, about 4.25 light-years away — a small red dwarf with at least one planet in its habitable zone.
- Distance
- 4.25 light-years
- Type
- M5.5 red dwarf
Source: ESO / NASA exoplanet archive