You are here: Home Dictionary sun
Personal tools

sun

The central (and most massive) body of our solar system; the star closest to us; a ball of gas with a radius of 700000 km and a mass of 1.989·1030 kilograms.

[Problems reading expressions such as 1030? See exponential notation.]

In the interior of the sun, nuclear fusion processes run their course; they are responsible for the sun's impressive brightness.