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| Zoom Astronomy's THE SUN |
| Introduction to the Sun | Solar Structure | Size, Mass | Flares, |
Sun's Birth | Solar Eclipses | Activities, Web Links |
|---|---|---|---|---|---|---|
| Solar Rotation | Sunspots | Sun's Death |
The Sun's diameter is 864,938 miles (1,391,980 km). This is almost 10 times larger than the planet Jupiter and about 109 times as big as the Earth. The volume of the Sun is 1,299,400 times bigger than the volume of the Earth; about 1,300,000 Earths could fit inside the Sun
As compared to other stars, however, the Sun is about average; red giants like Betelgeuse are about 700 times bigger than our Sun (and roughly 50 times as massive). Betelgeuse is also about 14,000 times brighter than the Sun. Red supergiants dwarf the Sun.
The mass of the sun is decreasing over time, as fusion reactions convert hydrogen into helium, releasing huge amounts of energy in the process.
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