Star
The Sun
G2V main-sequence star
Our star
A 4.6-billion-year-old yellow dwarf that holds 99.86% of the solar system's mass. Nuclear fusion in its core converts about 4 million tonnes of matter into energy every second.
In your sky
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Key facts
Distance
1 AU · light takes 8 min 20 s
Diameter
1.39 million km
Surface temp.
~5,772 K
Core temp.
~15 million K
Age
~4.6 billion years
Spectral type
G2V
True colour from its B–V index (0.65): a surface around 5800 K.
Did you know
- Never look at the Sun directly or through optics without a certified solar filter.
- About 1.3 million Earths could fit inside it.
- In ~5 billion years it will swell into a red giant.