The Sun

The Sun

Our star, the Sun, makes up 99% of all the mass in the Solar System. Its core is so dense and hot that normally repellent nuclei fuse together in nuclear reactions that produce vast amounts of energy.

The Sun is mostly hydrogen (its main fuel) and helium, and radiates charged particles called solar wind across the Solar System. Phenomena such as solar flares and sunspots are evidence of the Sun's strong magnetic field, which changes on a roughly 11-year cycle.

Read about eye safety during solar eclipses on the NASA website.

Photo: The Sun taken by the SOHO probe (ESA/NASA)

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The Sun

About Sun

The Sun's core powers the Solar System.

About Sun

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