It is a massive sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface.. The sun has extremely important influences on our planet:
.png "Midwesty Review Kansan Lindsey Yankey's picture book illustrations")
The sun is the star at the centre of our solar system.. The sun is an ordinary star, one of about 100 billion in our galaxy, the milky way.