Stars

The Sun

The Sun is the star at the centre of our planetary system.

Type

Main-sequence star

Primary energy source

Nuclear fusion in the core

Understanding this entry

The visible surface is not a solid shell. Different observing wavelengths reveal different regions and processes. Solar observing requires purpose-made equipment and filters; never look directly at the Sun through unfiltered optics.

Further reading and reference: Topic reference ↗. Values and educational summaries are not a substitute for specialised advice.